There’s no doubt that this soccer player received a jolt of electricity (you can see his foot jump at the 15 second mark). I’m still wondering about the accuracy of this on the fly diagnosis, however. Can a sports trainer really make such a quick yet accurate diagnosis as to whether an athlete needs the use of a defibrillator?
I believe that these portable defibrillators have EKG sensors that determine if a pulse is actually necessary. If the heart beat is erratic, zap, the machine delivers the appropriate response. If not, then it doesn't go. I also think that a true flat-line stopped heart will not be zapped. For that, traditional CPR is the appropriate response and I think the machine will alert the operator to that as well.
I'd echo Geis' general point. If the portable defibrillator being used is an AED, it's fairly idiot-proof and safe. Even basic First Aid courses cover use of AEDs, which can detect heart rate and determine if a jolt is necessary. You don't even really need any first aid knowledge to use one- most modern AEDs come with speakers that walk the user through the whole procedure. It's actually pretty easy, then, to determine when one is necessary (a slowing or irregular heartbeat, I believe).
The language of the clip is Flemish and the commentator says that the player has had an implanted defibrillator or ICD for years. Good call by the doctors who prescribed it for him :-).