Neither of the big animals look normal. There's a white outline around both, their eyes glow, and while they aren't quite photonegatives both have a bit of that look. And dark teeth.

Nat yelps as the tiger pulls away, and all unthinking chases after it. She jumps and grabs at it just as Tony roars.

The tiger is an aging zoo animal that has never seen the wild or seen anything more exciting than a breeding program or an unfortunate duck landing in the enclosure. It's still a wild animal, clearly, but it's running on the 'fight' side of fight-or-flight. The bear, all the noise, being grabbed by something it can't attack, this is all too much.

So it takes off at a dead run. Half riding it Nat hangs on to its neck briefly, getting jounced, but she lets go, tumbling to the ground as it bounds away. A little dazed she picks herself up.