Board Thread:Versus Debates/@comment-27233105-20160130092635/@comment-27233105-20160217053953

Here is the moment Itachi used M:S on Killer B. Imo, the four frames don't necessarily express any amount of time. Gyuki could've poked B just as Itachi began to speak, any time during Itachi speaking, or just after. This is also inconclusive, but what we do know is that B was helped out of the M:S.

The reason I think the symbiotic partner will dispel in a safe amount of time is because B witnessed himself a victim to a similar terrifying experience that Kakashi did from Tsukuyomi. Here is what B saw, then shortly after B explains how he was safe, here.

With genjutsu there seems to be one constant: a partner can dispel it for the victim. An external partner wouldn't be able to dispel as quickly as a symbiotic partner, simply because the external partner doesn't know when the genjutsu starts. The symbiotic partner not only knows exactly when the genjutsu starts, he seems to also be able to dispel in a safe amount of time despite the victim already witnessing some terrifying experience.