In the meantime, your ribcage has been turned to jelly.
But he died with his vest on.
Not if the rounds hit the plate armor.
IF the rounds hit the small plates. There is a lot of exposed torso which is only protected by soft armor. And there is unprotect upper torso without any protection--arms, shoulders, neck, face...
And there is no side shielding. So, a torso traversal from side to side is also quite probable.