as a frost mage, this is how i did sm cath in 1 pull
1) i enter the instance first and then the slaves after the mage's screen's finished loading
2) i think the first dude is a lonely guy so he's like, 'o hai! party?' and ur like 'uh........no.' so u hit him with ur ice lance.
3) so u buff ice barrier and start pulling from the starting area and follow the blue line, ice lancing your way thru the mobs who aren't attracted to your spiky hair and putting up ice barrier soon as it comes down and also blinking whenever it's up!
4) soon as u get to the green square dot, open the doors to cath and summon your water elemental
5) make the water ele frostbolt mograine once then have him on your follow
6) this time, follow the red line until you get to the green circular area (looks like the aoe crosshair no?)
7) aoe to ur hearts content!