My players: get outta here!

The rest of you: sorry for the vague title, didn't want to give it away.

In any case, I was planning a stampede/mob encounter in a city environment. Nothing major, just something sort of big strong beast gets loose and starts causing trouble, and everyone around panics and starts running every which way. Something like a bull, not a huge monster. I'm not sure how to mode panic though. Here's some ideas I had:

- horses might attempt to go in a straight line away from it, dragging any carts along with them.

- humanoids would again attempt to flee, possibly attacking someone in their way.