Originally Posted by dhmac

I think it has been established that Travis blacks out and then becomes Gellar for when Gellar does stuff that Travis is completely unaware of. It was symbolically represented when Gellar hit Travis in the head and knocked him out with a shovel an episode back. Travis mentally imagined Gellar knocking him out when he had actually simply blacked out to become Gellar instead. The next thing that happened was Travis' sister was killed without Travis knowing about it.

And I think it's possible that in this most recent episode with Travis on the floor before jumping up to trap Dexter in the basement maybe wasn't him playing possum, but instead was him blacking out and then coming back to consciousness as Gellar.

Originally Posted by bluetoast

I like this. Makes more sense than thinking that Travis was just biding his time for days, or suddenly turned into an excellent actor.