"I- have an idea," Twilight spoke hesitantly.
Sombra'a ears flicked before leaning towards Twilight's voice as he raised his eyes to hers. "What's up?"
As soon as he responded her bewilderment only reinforced, his vocabulary was so laid back, and his tone and presentation were so modern for a unicorn that trapped his kingdom for a thousand years. Taking that notion in the back of her head she continued. "Since crystals are a stabilized shape, I think if you try to pour your magic on one side the distribution of weight should make it uneven causing the rest of the structure to be broken more easily."
Sombra took the idea and rolled it through his mind. "Wow, that's- wow." Looking up to Twilight he smiled brightly. "Should've known Twilight of all people would've figured a way to get out before I even had an idea."
Twilight couldn't help but feel a bit of heat in her face. Clearing her throat she kept talking. "It's mostly because I read up on reports of your- crystals." She dipped her head whilst cringing at that last bit.
Sombra could only give a small laugh, "Yeah, that does sound like you. Good idea too, I know if you went against the real Sombra he would've been toast." He eyed the bars with skepticism. "But if you're right, I need to find an irregular branch."
"Can't you just make one? You've already made a branch."
Sombra shook his head, "Nah," tapping the center bar he clicked his tongue. "I already poured out some magic into that one, building upon it would be more difficult." Frowning he looked back at his hooves. "It's weird, I can feel the crystal try to call out to my aura. It's like some kind of magnetism is pulling my magic to work on it."
Twilight hummed in thought before speaking. "I think I'm sorta understanding what you mean, your magic is fortifying the crystal structure, it's like a bonding agent, it's stabilizing the formation by your magic's strength. But if that's true then making any kind of branch would be too strong to break off." Twilight paused before speaking. "Can't you just try to moderate the magic you put out?"
Sombra shook his head. "This body is way too new for me to even understand how it dispenses magic, let alone know how magic even works. That's not including that these crystals have some weird obsession over my- aura? Energy? I don't know but anytime I move my hoof towards it." He extends a hoof for a moment as it slowly gets closer, his eyes narrow as he yanks it away. "See? Somehow the energy of the crystals have like wisps of magic emanating from them trying to get my hooves to touch them."
Twilight was now slightly worried. "I- didn't see anything..."
Sombra quirked an eyebrow, "Really?" He looked down to his hooves with concentration. "Weird." He whispered.
Twilight mentally noted the strange magic he described, dark magic this advanced wasn't quite explored because of the prime example of Sombra. "So you can't control your magic." She couldn't help but think how coincidental the excuses were at this moment to Sombra not being able to know anything about magic to help her out but she set that aside. For now, it was better to go along and see what kind of opportunities arise from there.
Sombra's eyes widened. "What if we overcharged it, the magic wouldn't have an outlet, it would just keep bouncing around until it breaks."
"That" Twilight paused at the consideration of the notion. "Could work." She was surprised, that kind of tactic would be something along the lines of Rainbow's train of thought.
"Brute forcing it could work, but you'd be burning through a lot of mana, since the crystals are taking your energy to expand we'd be playing by their game. We wouldn't even know how much it could take or even if you'd break it entirely."
Sombra wasn't bothered. "Even if it doesn't shatter, it'll grow huge fast enough to break through the cage and shred through the roof of it."
"Sure it'll work but again, the crystals are the ones with the upper hand, if you don't know its limits then it could react in numerous ways. You're forcing a boulder through a doorway, that energy could blow up disastrously in your muzzle. I mean the energy alone would bring a pony close to death!"
Sombra bit his lower lip as he looked to the ground, his eyes running along the floor in thought before breathing in through his mouth. "Let's do this."
Twilight looked at him like he was crazy. "Sombra, you're about to exert yourself beyond a normal unicorn, I don't know how big of a mana pool you have but if you can't control how much energy you're putting into this then it would be incredibly stupid to just pour out an insane amount of power into a single crystal!"
Shakily exhaling Sombra looked at the crystal bar with determination. "The way I see it, either the guards come back soon to wonder why I haven't done anything and find out I'm a faker OR I break you out and you can save the kingdom."
Twilight couldn't believe how stupid of a risk he was taking. "Sombra, you could be entirely wiped out from this much magic. I mean unconscious or too weak to walk. I know you are resilient but doing this would be-"
"I've already made up my mind, Twilight." Sombra took shaky steps towards the bars, his body was becoming more shaken as he got closer. "I was a coward to not do anything for Sombra's soldiers, I'm not going to make the same mistake with you being held captive."