I'm sure the old guard has seen this many times, but I just found it and it perfectly matched how I see Derpy In The Chase. You do NOT mess with her foals.

Sparkler wouldn't be running. Well, not away from the changelings, anyhow.

Not sure which would be scarier, a calm Bucky, or an enraged Derpy...

5240801 Maybe this is pre-geomancer Sparkler. I'd imagine this is how she'd act before the Isles toughened them up, just focused on getting Dinky to a safe place rather than try to fight.

5240865
Given that I believe this is supposed to take place during the changeling invasion in season 2, that's pretty much right.

Derpy: Untrained master of the drunken wing.

Yeah, I knew about this video and the other similar with Octavia.