...to start heroic modes this week, since I still haven't killed Garrosh on 10m and was expecting at least another week of normal, but no such luck.
Heroic Immerseus actually seems like a fun fight and I was actually enjoying the challenge by the end of the raid; it was just that I started behind the 8 ball by a) not having read up on heroic abilities; b) starting half an hour of attempts behind everyone else (I was expecting to be late, so they had a replacement in for me until I got there); and c) being informed by the other hunter that since our planned placement was quite far back from the boss, I should go Survival because our pets would likely despawn - a spec I hadn't played for awhile.
As it turned out, I realised after a few attempts that Blink Strikes was the pet problem - we had switched talents due to A Murder of Crows apparently being buggy and giving too many stacks of Corruption, but Blink Strikes was then automatically putting our pets too far behind the boss and into despawn range. Switching out for Lynx Rush seemed much better.
Unfortunately by the time I was comfortable with the fight, a lot of others were probably getting tired. I can see him going down possibly next week if we can pull it together - it doesn't look like a difficult fight as long as we all stay alive!