Enemy list

[IMG]http://img.photobucket.com/albums/v6...ps9353c330.png[/IMG]

When we have multiple enemy on the list, the list will display the remain HP of those mobs. I usually use this as an indicator when to switch to another mob (since Im using caster, I have to measure the rate/pace of the killing and predict when to move so that I dont overcast)
The picture shows that my Fire already landed on the 1st enemy on the list, and since I measure I wont have the time to land another fire on it, I quickly chose the 2nd enemy on the list
When the 1st enemy killed, the 2nd enemy will move up to the 1st row. I have my cursor ready at the 1st row and I click it, to resume the fight
But sometime, when the other player get a crit (or maybe it happen all the time), the 1st mob vanish from the list, 2nd mob up to 1st row, but for a transient time the 1st mob re-appear in the 1st row. I ended click on the deceased enemy and start casting the wrong one.
I dont know whether this is an intended game mechanic or just a delay on my client side, but if its really an intended game mechanic...
My request is, can the UI team make a fix position of the enemy list as is just like when the list first made? So when the 1st enemy die, the row will still empty, and the 2nd enemy wont move up on the list?
OR
if its difficult to implement (since perhaps its a working sorting methods), can we have like a longer delay (or its a shorter delay? *shrugs*)? or at least make it so that the deceased enemy in the first row wont re apper

thanks