HMX rooftops glitch

when you start the game, go to the part with the ladder and pass it.go right and there will be walls. go to the corner and use the LAG JUMP then when u're standing there, go to the right and jump when u cant move right.If you fall down, try it over and over again.Only xeno can get u there or the mutants who are standing one crouched, other one on the crouched one.I will do a video ASAP message me if liked and helped u.Party with the glitch!