Give me an unexpected cold shower that knocks me about, try to pick me up after with no time to calm down, I will do more than just attack your finger! [removing tongue from cheek now]
I would imagine -in the wild- that mantis loose grip and fall now and then. Being light weight not much damage is done, most of the time.
The only 2 times I have been attacked were my fault. So now I really try to remember to move slowly and deliberately around my mantis area. That slowing up prevents a lot of mishaps for me.