The impact of the bullet, although stopped by his chestplate, was enough to send him stumbling backwards, mostly due to being taken off guard because bullets didn't realistically toss people backwards nearly as far as movies lead people to believe. Small pieces of his armor sprayed everywhere as it's molten layer was revealed underneath the cracks, bubbling up to fill in and harden the gap almost as quickly as it had appeared, although not quite. Had it been any more rapid fire of an attack that would go against him in three seconds time it could have whittled through the repair work before it had time to completely cool, but luckily the rate of which he was to be attacked was just enough to go up against it's completely solidified state. 

He could feel the armor draining a small portion of his energy to achieve the repair, although a single bullet at a time wouldn't make him pass out from the effort or anything for the time being, even if it did take more of a toll on him than he'd like when he wanted to save his strength for cutting through that giant robot. He definitely wouldn't want to stand around eating bullets for very long, that much was certain. This guy's aim was surprisingly good she he couldn't rely on dodging, even if he was decent at it. 

While rushing forward at roughly 30 feet per second with a clockwise curve to his run around the side of his opponent so he wouldn't be getting hit straight on, and taking into account him getting hit a second time and stumbling as a result, he got within 150 feet of his target while only taking that one more shot after the initial one, 5 seconds total since the first hit once he reached this point. He would continue running closer, but at this range he felt comfortable in tossing his right chakram with a horizontal swing at the robot, aimed towards the knees to try and at least stop his attack momentarily as he was forced to dodge or block it somehow, but at the speed the chakram could travel and the distance it wouldn't likely make a major hit unless the rider was incompetent or the mech wasn't very maneuverable. At 70 miles per hour, the chakram would take just over two seconds to hit his target, about the time that his opponent would be taking his next shot. It was time to see how he would proceed, which would determine how Saanga would, but for now he'd keep advancing.