Yup, just position yourself smartly and not like other side of the room where the tank with other debuff is going to be and you'll make it in time every time. As a hunter, Disencage is a lovely thing for this. <3
Evadd, Your raid members that got PT were not reacting fast enough. You have about 15s to move to the tank before PT will immobilize you. As stated before, one of the debuffs is always on the tank that is on the worm that's "on top". The other debuff is randomly targeted in the raid. Members of the raid need to be aware that they'll have to move to the tank of the worm that's "on top" and not get too far away from him.