against the water. people started freaking out. >> oh [ bleep ]. >> aaron strunk doesn't think twice. he jumps in after chris. >> holy [ bleep ]. >> as soon as i surface, i saw him kind of floating there. >> he was like a bobber on a fishing line. >> chris' body quickly begins to sink beneath the surface. >> we thought he might have just been passed out at first. that's when we started seeing the blood emerge. that's when things got real serious. >> call 911! >> luckily one of the boats of onlookers happen to be a group of army medics from fort hood. they immediately jump into action and swim toward chris. as the medics try and stabilize chris, his friends are panicked.