Halo Reach - Pillar of Autumn - 2x Assasinations

This was the Assasination after I got the achievement "If They came To Here Me Beg" but this was only to show what happened in the game. Something was wrong on the mission after the assasination of the Elite, the grunts didn't notice anything but the jackals did even when bumped into the grunt sleeping it woke up behind me and even didn't attack o_0..... So I hid behind the trailer and wait unitl the grunts moved along by watching my motion tracker, then I ran the wrong way to make a plan throughout the mission.