Steelers Wide Receiver DK Metcalf Throws Punch at Fan, on Video

DK Metcalf might have nerves of steel … but, a Detroit Lions fan got on his last one — and video shows him taking a swing at the guy!

The wild moment went down late in the second quarter of the Lions matchup against DK’s Pittsburgh Steelers … with the CBS broadcast first showing a tense convo between the veteran wide receiver and a DET fan in a bright blue wig.

Metcalf then quickly reached up with his closed right fist … seemingly landing a glancing blow on fan’s face before walking away.

As broadcaster Jim Nantz says in the clip … we’d assume DK will face some major consequences because of his actions — though he wasn’t removed from the important matchup against the Lions.

According to ESPN … because a flag wasn’t thrown at the time, the NFL can’t weigh in on disqualification — which it the only reason they let the guy keep playing.