According to Mission 3 of the ARG, during training, VECTOR managed to break out of HUNK's neck breaker and then flip over HUNK using HUNK's arm to lift himself up.
Whenever a player uses his Mimicry ability, they become a holographic version of the person. You can only mimic a Spec Ops member or an Echo Six Spec Ops Unit Operative. If he takes damage though, the mimic disguise will wear off. VECTOR still has his normal voice when mimicking anyone, even females.