New Fire-elemental
Assuming you have default controls.
Step 1: ranged weapons
Step 2: lock the target (click him so it is selected, dont let the auto target system do that cause you switch to embers too easy.)
Step 3: start hitting him, concentrate mostly on your #1 skill (auto-attack). use arrow keys (not wasd) to move around while your hitting him. Do not use any skills with an activation time that requires you tostand still.
Step 4: never stop. If you wanna help a downed person do it but never longer then 2-3 seconds. Defeated players should always waypoint (even if they are not interested in participating anymore, being dead on the ground scales the event up.
The whole event is bout staying alive and not bout DPS. As long as all keep hitting him with #1 you will get him down in time. The other dps skills are there so you have time to heal/down/etc.
Arise, opressed of Tyria!