Rachel doesn't have to do much after that, really. The shape alone, once they realize what she is, is enough to get everyone to back up.

It helps that she decides to inform the bar of what she is but throwing herself up, rearing up onto her back legs, seven feet tall and little furry ears brushing the ceiling. If a few cowboys get thrown on her way up there, no bother.

And just in case anyone missed the memo, she follows it with a roar.