I think the apology was more for leaving Harold to fight alone, but the timing was such that it could be misinterpreted as that, and then Harold misinterpreted it a third way, lol.Yeah... The old man should be a bit more than just down, after all that.
The little bit of Yuno remotely apologising to Erica for healing Harold was a nice, traditional misunderstanding in the middle of this. I doubt Erica would really become jealous because of it, though, even if she started learning healing magic because of Harold.
god damn they did. HypeNot bad. They actually depicted a dmc-ish combo in manga form