Take the 2-minute tour ×  Is there some special combination of
buttons to perform the new extended assassinations in Halo:
Reach? Like where you knife someone? I can only seem to do they
typical Halo behind the back assassination when pushing RB.
share|improve this question If you play the 3rd mission in the
campaign (Nightfall, I think - the one where you start w/ a
sniper rifle), it sets you up to assassinate an Elite early on,
complete with a button prompt. That might help you to do it in
multiplayer. –  Adeese Jan 3 '11 at 20:35 add comment  3 Answers
up vote 4 down vote accepted  You need to sneak up behind them
and hold the melee button which is usualy the right bumper.
share|improve this answer add comment  Yep you need to hold the
button rather than press it - that's how the game decides which
you do.  Assasinating someone is not always the best option, if
they are weak and there are several enemies around it is best to
just tap it for a regular beatdown as you can start attacking
other enemies soo