I'll have Henry revive around the tail end of the initial invasion (2nd? 3rd?) at which point he will assist Nick with command and give poor Nick a break, though... obviously he'll be not quite right. And obviously he'll be straight back into the fray regardless!

In addition to fighting Null, he'll likely contact the clinic and the fire brigade to see what's going on with them, and give the Guard (and Maketh) a rundown of exactly what happened in Hope's temple before he died.