I'm betting he forgot to switch to Frost Presence, that would explain the aggro problem.
I have been tanking with my dk for a while now, our guild has a few resto druids, and I haven't had any problems with them healing me in heroics or raids. Could have been one of those runs. I remember going in there and rolling all the way to the inn and wiping on trash because every heal missed me. MISSED, hehe.
I would give it a few more runs before assuming this match is doomed.