Game 1 has been a catastrophe for the Colorado Avalanche. The Dallas Stars, on the strength of their productive first line, put up three goals in the first period, and then, early in the second period, goalie Philipp Grubauer got hurt.

It’s not clear exactly what happened, except that it was bad.

In the waning seconds of a Dallas power play, Stars forward Denis Gurianov put a wristshot on Grubauer. Grubauer extended his right leg towards the center of the goal mouth, then something bad happened.

Grubauer fell face-forward onto the ice and did not get up for a while. He was eventually helped off the ice by his teammates, but Grubauer did not put any weight on his left leg.

Backup goalie Pavel Francouz came on ice in relief.

Grubauer, 28, has had an injury-plagued season. He missed time in November, then a longer patch in February, but he has been elite since returning to the Avs for the postseason. Grubauer played three seasons for the Washington Capitals, including their 2018 Stanley Cup Championship.