Seven minutes into the second stanza, Union forward Mark Szucs fed a puck to forward Brent Ozarowski. Ozarowski took a soft shot, but caught Prestifilippo off-balance and the shot slid into the net.
"We haven't been playing as well [on the short-handed unit]," Harvard coach Tomassoni said. "We've made some mistakes, and they've ended up in our net."
Harvard had three more power plays, including a five-on-three and a four-on-three, but couldn't convert.
Union netted two more goals in the third stanza, including its third power play goal of the night, and Harvard seemed to be completely out of the game.
But there was still a little life left in the Harvard squad. Playing short-handed, freshman forward Trevor Allman stole a puck from a Skating Dutchman at center ice and took the puck up the ice on a breakaway. He timed his shot perfectly, finding the five-hole and pulling the Crimson to within two.
But despite a late rally and a power play, Harvard fell short. They would have to wait for Saturday night to gain any points on the weekend, as well as a chance to make amends for Friday's loss.