Frustration turned to fisticuffs during the St. Louis Blues' practice on Monday, when teammates Robert Bortuzzo and Zach Sanford went at each other.
The Blues have lost eight of their past 11 games, including a 6-1 loss to the Vancouver Canucks on Sunday, which likely helped fuel the flaring of tempers.
Bortuzzo unloaded three rights on Sanford before coaches moved in to separate the pair.
"That happens," Blues interim coach Craig Berube told reporters. "Guys are frustrated, and they should be. So sometimes in practice, it boils over and things happen.