The title kinda states it, apparently blu engineer has made a mistake which appears to have cost heavys and spys life. Thus making it an accident. :icongeniousmemeplz:
Very close. The Red Spy's sapper exploded the Blu Engineer's sentry gun causing the Engineer to back into the bomb, taking with it the Blu heavy and the Red spy as he tried to back-stab the heavy.
Like what's going on in this picture?
Thus making it an accident. :icongeniousmemeplz: