Originally Posted by
istrain
I have a macro similar to yours that I use when I tank him and it works fine; I added in /cast Taunt and /cast Heroic Throw .
When he comes off the spike he likes to smack a random melee person because the head and the body seem to have different aggro tables.
I heard they were fixing it. Anyway on your topic.
The only thing I could add to help really is that when he comes off the spike there's about 0.5 - 1 second where the Exposed Head of Magmaw switches back to Magmaw himself. Just hit the macro a couple times rapid fire as he comes off and your target will switch over to Magmaw himself. If you're using simply /tar Magmaw it should work both ways to switch back and forth between the body and exposed head phases.