They didn't say it but I think it's apparent that Gabriel was bit when he got hit with the zombie waterfall.

Eugene has all his evidence lined up to prove Dwight is the inside man, but I think this is where his redemption arc finally gets some legs, and he finds a way to put it on someone else. Probably Simon, because there was tension between Negan and his right hand man more than once this episode. "If you were trying to sabotage your group from the inside, wouldn't you put all your faith in Gregory?" Something like that.

This is the version of Daryl I like the best, primal and no nonsense. I think once the writers learned that people like seeing Daryl cry and be vulnerable they started leaning into that side of him really hard but every once in a while the hardened lone wolf comes through and its perfect.