Yeah. That's about the only way that I can figure it could be done optically. Or else just fix it in post.
From a visual standpoint I know it lacks realism if we have a man bleeding out against the bench with no footprints or disturbance to show how he got there. But visually it looks better. I'd also costume the man in very gray colours, with almost the only noticeable color being the pool of red slowly spreading. Frank Miller-ish.