Tormund is not dead, and he has a lot of plot armor because he can't be replaced. Early seasons (and the book) are good because there are so many damn characters when one dies, their role can still be fulfilled.
Tormund is effectively the last of the wildlings outside of Gilly. Sure, there were scrubs with him at the wall, but all the named wildlings are dead and have been dead for some time. If Tormund dies, then Jon's whole martyrdom of letting the wildlings in doesn't mean anything because they just all died anyway. They are also gearing up for the big battle to be "everyone" vs the undead (outside of Cersei). They need a wildling contingent there for that to occur, and they aren't going to be like "wow look at all these people, you have a Lannister, Starks, Greyjoys, Targaryens, uh this random wildling extra we found, the Vale, etc all fighting together!".
Once they stopped giving us extra wildling characters to meet and talk to, Tormund has been basically untouchable.
Hm, this is good logic I guess. Should have shown him escaping in that case. ---