Over worked and needs rest. Lay him down on a soft surface with head elevated with his body and give him lots of water because he could've gone through heat stroke or over working the body which could lead to fatigue
John likely fainted due to heat exhaustion from overexertion in hot weather. To aid his recovery, move him to a cooler area, rehydrate him, and monitor his symptoms. Quick action is necessary to avoid more severe heat-related conditions.
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