How would Iron Man keep up with him? Remember in the mr. Mxyplezx episode when Clark threw a football then went into superspeed mode? He ran about 600 meters, broke Chloe's chaincuffs, disarmed and then threw her attacker then went went back to the football field and resumed his normal position. Noone even noticed or could react to him. No way Ironman would be able to hit him.