With guard that have 2/3/3/-1/1 that should result in 0,39 succesfull attacks/guard (not counting the extra attack for the alpha), which with a group of 5 that results in about 2 attacks hitting. With the eternal starhost bonus that results in about 4-ish wounds per unit. Which with 3 units is about 12 wounds and a castellant can only heal 1 unit at a time. Shouldn't be that bad unless I'm missing something. Was he fielding just 1 unit of dracoths as his frontline or something? That's the only one I can think of that would actually manage to do this. The others would be liberators and prosecutors but those only have 2 wounds, which makes the heal not reliable enough to actually help all that much. On a sidenote, shields should be worth using if he currently has no wounded models in the unit. Worst case he heals the wound he just got, best case he overheals while at full health then gets wounded.