Ok now that people are chiming in! =)
So when the rooting/goop hits and it seems to stick the victim, while said vicitm is either in mid use of a skill or attempting to use a skill while being goop'd they use their last abilty. Something similar can be observed in Garden Ops where gooping a AI right before they use a skill (the apporiate timing of the skills usage) will result in the duration of the goop not lasting nearly as long! While I've noticed that in all other game modes including Op's that if users apply the goop without any of the said cirumstances, then the goop last the complete duration it is supposed to.
Which leads me back to my orignal point of some people know of a different method where the root/goop doesn't even effect them and they freely move! Not as in where the effect has been applied and right before the vicitim was able to use a skill to evade gooping. Or whatever way we can word that. Not sure how they are doing it, or if it is meant to be in the game, but once again I've seen 2 people, one of which told me in a private message "stop whinining" when I clearly asked him "hey man, how are you able to move when I am using the super goop?. thanks".