Night Elves have some cool tricks. If in a long fight, you can vanish(just one example, there's a million other ways to get your opponent out of combat), get your opponent out of combat (6 seconds without doing anything).
Then sap him, start eating and immediately hit shadowmeld, he wo'nt see the transition. Eat for 8ish seconds, sap him again, wait for energy ticks and open up on him again.
Edited, Jan 20th 2008 6:50pm by Zornov