I tank a lot with other tanks on teamspeak all the time. And I hear this all the time
"Hang on, I can't find it"
/spiney plume explodes

Just wanted to make sure tanks are aware there is an enemy list on your UI with all the enemies on it. You can just find the SPiney Plume on the enemy list and click it on the enemy list to target the spiney plume, or w/e mob you are looking for.

Tab Target is a sure fired way to get a spiney plume killed, or someone else killed.