I BET IT WAS WARM
Another example of your subconscious sending you warning signals. I’ll bet that seat was pretty warm when they first sat down, and it took a few seconds for their brain to catch up to the danger. This would have been featured on 1,001 Ways To Die if this person hadn’t listened to their gut instinct and moved away.
As 400 people die from electrocution yearly, and 40,000 receive a life-threatening electric shock annually, let this be a lesson to stay away from power lines or any other electrical item if you suspect something is wrong. Always wait for professional help before trying to fix the issue yourself.