Well, he knows nothing about lightning strikes. The #1 priority is to move the person to a safe location that the lightning can't reach anymore. Then you can start with CPR, but you should start with checking to make sure they are still breathing and that their heart is still beating normally. A lightning strike can lead to cardiac arrest. Mouth to mouth is probably 5th or 6th on the list of things to do.
Also why wasn't an ambulance an option. C'mon bruh.