I'm pretty sure the fight in question is the one you do to get Bless. That aside, he was walking along and was ambushed, so if he did have Bless already at that point, he would've had to have been casting it every 20 seconds or whatever out-of-combat while walking around to keep it up. And he's not talking about difficulty in general. He's talking about getting ambushed, and before he gets to go, his entire party is stunlocked until they die. It's basically like you're walking along, everything's going fine, and then suddenly you're dead. There's no strategy. You're just dead. That's not right.