The NHL said Dunning was taken to a hospital for precautionary reasons and that all neurological signs are normal.
Manson skated alone on the ice when he slammed into Dunning early in the first period. Dunning went down in a heap and lay prone on the ice for several minutes. Dunning appeared to be moving his feet and moved his right hand when Manson went to talk to him.
The game was delayed for several minutes while trainers and medical staff tended to Dunning.
Dunning is a former professional hockey defenseman who played parts of three seasons in the OHL. He later shifted into officiating and was promoted to full-time NHL status in 2022.
The game continued with one referee and two linespersons.