1) When you're on a ledge and you pull yourself up and press Shift to block, it won't work right away. Even if you were standing and the animated looked finished. While you're still holding down Shift, it won't swap you to Blocking mode. I think that needs to be changed. (same with landing after falling from a jump)

2) When you're blocking you can't use Trip. It will trigger the cooldown and waste the action. You have to stop blocking to use it. Casters can cast while holding block. (though makes them temporarily vulnerable as if not blocking)