Rask made 28 saves in Game 6, including 12 on the penalty kill, but admitted he got a bit lucky on Pietrangelo's rebound and was grateful for McAvoy's assistance.
"Actually, I saw the replay after (when) I was doing an interview," Rask said. "So it hit the post, and then it kind of was bouncing there. I think [McAvoy] hit it with his stick and I kind of heard it. I didn't know where it was, and I figured it might be somewhere behind me, so I just tried to corral it with my hand behind my back and then it stuck in my pants and then it fell somewhere. But I think [McAvoy] made a great play to keep it out of the net. It's never a good thing to be facing the play with your back, but luckily it stayed out."
The timing of McAvoy's play was key because it prevented the Blues from shifting the momentum.
"We did have some good looks and some good chances, but you need the result," St. Louis center Ryan O'Reilly said. "There were a few times there where it could have given us the spark we needed, to grab the momentum. Unfortunately, we didn't."
The Bruins went on to score four third-period goals.
"Second period, 1-0, we wanted to preserve that lead," McAvoy said. "[Rask] stood on his head and gave us a chance to do so, and whatever I could do, I just tried to do. Just a split-second play and I was really more thankful than anything that it stayed out of the net."