During the timeout, everything was going as normal. Both teams sent their players over the boards for the next faceoff while the goalies skated to the bench to take advantage of the stoppage of play. As Bruins netminder Jeremy Swayman was heading towards the bench, he had an unusual interaction with Max Domi.
The contact is more visible from another angle, which shows how Swayman sold it a bit. Domi clearly made contact with the goaltender's shoulder, but Swayman deliberately embellished it, surly trying to draw a penalty from the officials.