It is very important that I note that there is no amount of training or handling I can do that will create a glider who doesn’t crab.
Crabbing is normal.
It can mean anything from scared, to vulnerable, to just the age of the glider. When your glider is about 7 weeks to 6 months it’s going to have much more energy than any other point in its life. It will most likely crab the first few seconds it’s around people even if there is no reason to.
DO NOT let this intimidate you. I’ve seen grown huge men cower at the sight of a crabbing glider. Remember it’s usually all talk. They are like toddlers. They’re going to test you so don’t let them get very far and you’ll be fine.