Okay then lads;
I'll need an infiltration roll for Mantis and then a teamwork test for the lift:
-Knives is the leader and will roll BOD+STR +Mantis's hits to hit threshold of 5 (mantis's BOD +1)
-Mantis is the assistant and will roll BOD + STR at -2 (-4 untrained + sheer wall, +2 assisted)
Glitches on either test make it noisy, crit glitch is a drop/fall/rope slip
---------------------------------------------
Or, if you would rather; Mantis can just attach to the rope with the gecko (no roll) and knives can haul him up and roll an extended BOD + STR {12, combat turn} test.
This is noisier as mantis will be hitting the wall a lot but slightly safer in terms of glitches. (glitches just extend the time it takes to do the lift, crit glitch doubles the interval)
Either way, state your preference and roll the dice :-)