She can understand that, really she can, but they also had to try to stay safe in order to do something.

When it starts charging at them, she grabs his hand. "C'mon! We can at least lead it away from other people!"

If they can find someplace less populated, they'd have more room to deal with...whatever this thing is. And it would hopefully give them time to come up with a plan.

So long as it didn't catch them first.