The best way to describe it for me.
dogs bark.....gliders crab.
it's just their natural defense against anything they want to go away. they
aren't going to win to many fights, so they try to chase away the bad things. When they are under cover, in pouch, your movement/noise is the bad thing, and it's
their job to scare it away for safety.
In our 6 colony we still have one small crabber and in our newer 5 colony
I have 2 BIG crabbers.
Over time they should stop if they bond well with you, or one might keep it up
for the good of the colony.