I really dont get it, especially with the IRIS-T, after the missile locked on with the ir seeker, why are they missing when the heli is landing?
Its a tactic that makes helis impossible to hit. You can fire as many rockets as you want, but they fire all of there rockets, while flying over the helipad, then they land and all the AA missiles miss. Then they reload and shoot again untill you are gone. Its a major advantage that makes them nearly invincible.
AH-64Es have LDIRCM so are immune to IRIS-T completely. Regardless of whether or not they are landing
(which is very dumb, not only are IRIS-Ts immune to LDIRCM, but each LDIRCM emmiter should only be able to handle one missile at a time, at the moment, it renders all IR missiles, no matter how many, useless. Very stupid. Its why the Pantsir SM-SV or Pantsir S1 are the only viable top tier anti-heli SAM)