Unfortunately, yes. Even bridging is 'find a weak spot in the divide and then punch through it.' [Naoki ignores the intrusive stuff as much as he can, really.]

De-infiltrating someone involves finding the kernel of them that's in the infiltrator's mind and bringing it up to the front. Actually giving them their own body requires getting into Thorne-san's goo tricks, which I'm still working up to, so regular de-infiltrating leaves them in a half-infiltrated state.

The handy part is, if you know who the person you want to de-infiltrate is at the moment, you don't necessarily have to know where they are.