Saanga's armor would cushion the blow he would feel from inside the suit just like it had when hit by the bullets, so dropping from this height, or any height really, was of no concern to him other than the fact that the mech was able to dodge him in time for his downward thrust. Once it became clear that this was the case, Saanga shifted the focus of his attack, winding his arm backwards at the elbow and holding his weapon like a javelin, setting his sights on that blasted larger weapon. Take that out and he could win the battle!

However, it all happened so fast that as he was throwing it, the mech had covered far more distance than thought possible in the short amount of time, wagging the weapon around with all of it's movement, causing Saanga to miss wide what would have been a simple shot to make, given the size of his target and close distance until that moment. His jaw dropped from inside his helmet as he thought, "ARE YOU KIDDING ME?!" 

He knew his odds of winning were quickly diminishing. He'd have to act fast to regroup or else he'd be done for. As he touched down he made an attempt to turn tail and run, protecting his destroyed front portion in the process and repairing it before doing anything else.