For a little while there, it looked like the Leafs could've beat the Bruins and come back from a 3-1 deficit, and that's mainly due to Joseph Woll's great performances.
Unfortunately, he got injured and was forced to sit out on game seven, and the Leafs ended up losing in overtime.
Brad Treliving, the general manager, revealed further details in his end-of-season availability, stating that the goalie hurt his back:
Treliving mentionned in his press conference that he still believes in him, despite his injury history. However, he plans to find out why he keeps getting injured to prevent further complications in the future: