I have to admit, I wasn't thrilled with this episode. It felt like it kept repeating the same thing with not enough content. I didn't like that they didn't even address Beth's death in the episode but instead went right into another main character's death. And I don't understand how Tyreese would have let his guard down so much inside the house when he knew there were walkers around.
And the commercials...way too much. We ended up watching the clock and the show would run 3 minutes and then have another 3-5 minutes of commercials.
OMG the commercials were way too long. Ridiculous. I get that they make a lot of money via advertising, but come on, the show breaks for 3 months then we get about a half hour show.
I think Tyreese let his guard down because the walker seemed to be in a room behind a closed door. When he walked up to the room and heard the hissing, I said , "that sounds like a kid." I am assuming it was that walker that bit Ty, but I don't know how he opened the door. I think he was also thrown by the pictures of Noah and his brother for some reason.