There is the game and there are real emotions for friends. Injuries are very real and I can confirm it is horrendous to see friends in pain. You can grandstand and advise players to "be professional" but it is secondary to the human aspect.
Stroud played adequately after that situation and the loss was not due to him being emotional by seeing his friend so gruesomely injured.
You are entitled to your opinion but I won't point a finger at Stroud to openly display emotions .