So yesterday i got totc 5man as random hc. I was playing my frostspec with Glyph of Eternal Water - Item - World of Warcraft.
1. Bind and use this macro, before getting on a horse:
#showtooltip Summon Water Elemental
/cast [nopet] Summon Water Elemental
/stop macro [nopet]
/petpassive
/petattack
2. Get on a horse and start the event.
3. Now you can press the macro while targeting a enemy, and your water elemental will attack it (you prolly cant see the macro but if you have bound it, it should work.)
Imageshack - lolwe
PS. you can prolly use another macro, but that was what i used.
Sorry if its a repost