The lead vocalist of Staind stopped a show this weekend to yell at a group of audience members he saw molesting a teenaged girl.

The young fan was crowdsurfing at the Kansas City Rockfest on Saturday when audience members reportedly began groping and molesting her—apparently an all-too-common fate for female crowdsurfers.

Staind's frontman Aaron Lewis spotted the rough activity from the stage and immediately stopped the show to call out the offenders.

"Alright, listen up you fucking assholes. That fucking girl right there is like fifteen fucking years old and you fucking pieces of shit are molesting her while she's on the fucking crowd," Lewis told the crowd. "Your fucking mothers should be ashamed of themselves, you pieces of shit. If I fucking see that shit again, I swear to God I will point you out in the crowd and have everyone around you beat your fucking ass."

Witnesses said the girl was let down safely and the show resumed.

"It shows a lot of character," witness Allen Roach told KTV News after the concert. "And I think the fans will see that, we're starting to see these things as being frowned upon."

Kansas City police expressed interest in investigating the incident but say they can't do much because the girl has not come forward.