OW. OW. okay okay, in Cloud's defense, there was nothing he could've done 'bout Zack or Aerith, 'kay? As much as I hate to admit it, there was nothing. If he tried to help Zack (never mind that chocobo was loopy from Mako poisoning) he would've died alongside his best friend. And with Aerith, no one expected Sephiroth's attack. They were completely taken off guard.