Only 1:17 in, first round pick Nikita Scherbak's blind back pass was picked off by Spooner, who went in alone to beat Dustin Tokarski.
The teams exchanged power-play goals. Fraser scored at 9:12, and Sekac beat Niklas Svedberg with a shot off of David Krejci's stick at 19:52.
Thomas tied it at 16:49.
Michael McCarron, Montreal's 2013 first-round pick, sustained an arm injury late in the second period when he went to the net.