Veillette is quite correct. You want to Shield Lob the enemy you want to fight first (advanced: Macro it so it puts a 1 on the target). You can then run farther in, if possible and use your first Flash. Do your enmity rotation and use Flash again. Depending on how much damage and healing is going on you can repeat this. Do more damage if you're good on enmity. There is also a list displaying enmity by icons and if you target one mob, it'll say under a person's class icon what their hate level is like.

Anyway, just read your skills going forward. Keep a look out for provoke.