This gif was why this scene was so heart-wrenching to watch, because they actually believed he got through the surgery, they thought he was going to recover.
but then realization sets immediately, they know that they have lost Adam.
Drew is aware that his best friend, his brother, is gone forever and his entire world comes crumbling down.
Dallas has, yet again, lost another one of his close friends, first Campbell and now Adam, who were both like brothers to him.
this is the moment that really hit me the most, because just like that every string of hope they were clinging on to was ripped apart.