Trigger event depending on bone information

Hello!

I wish to make my BP_ThirdPersonCharacter fall over whenever the angle of the foot is over some threshold but I don’t really know how to approach this problem. The falling over part is done, I’ve bound a key to make the character ragdoll, and then turn back. But now I need to trigger the “falling over”.

How can I get the bone rotation for the foot? If I have that, I think I can figure out the rest.

This is my current approach, which doesn’t work: