Montreal scored its second goal on a following powerplay, taking a 2-1 lead that they would protect to force a deciding Game 7.
Lucic has played poorly against Montreal this postseason, scoring no goals with just one assist.
If Lucic were suspended, rookie forward Tyler Seguin would have been the likely replacement for him in the lineup.
With the Bruins powerplay failing to score a goal in about 20 attempts, Seguin's speed and offensive talents could help ignite the struggling powerplay unit.
Nicholas Goss is a Boston Bruins Featured Columnist, follow him on Twitter for Bruins news and opinion.