User blog comment:Nobody700/What If: House of Evolution arc part four/@comment-5038468-20151207042936/@comment-3045030-20151207043916

that's actually pretty common, (unlike Boros, with his Meteoric Burst) most (people/characters/beings?) would not go all-out from the start (even villains/mysterious beings), not unless they have a reason {Beefcake upset for his mistake, Carnage Kabuto feeling cheated, Beast King/Vaccine-Man seeing Saitama's strength (sorta), Boros getting exited (well till Saitama he probably had no other reason than finish a fight quickly)}