Looks like he was breathing in the first part,,, so, they gave him breaths ANYWAY.
Then they gave uneven and different numbers of chest compressions, yes, he never had a chance.
Judging from the video, THEY killed him!
these dudes definitely don't know what they are doing...they definitely did kill this dude...his hands are in the wrong spot...and you don't hold the dudes nose when you're not giving him breaths!
he lost his blood... They need to rise legs and hand, to recover some blood for head, lungs and heart... They act haotically, but strong. Without acting to the cause of his cardio stop, they not have chance to win...