Weber drove Rust into the boards with under 10 minutes remaining in the third period in what was already a chippy affair. Weber was given a five-minute major for boarding and a 10-minute misconduct.
Penguins forward Tom Kuhnhackl received a two-minute minor for roughing and a 10-minute misconduct for his actions in the ensuing scrum.
Luckily for the Penguins, Rust was not injured on the play.
The Capitals traded a third-round pick to the Buffalo Sabres for Weber back on Feb. 23. This was his seventh game with his new team.