It was no secret that the fire which erupted and destroyed Marcus's office wasn't a mere accident and it was all part of a plan, and it's because who hides a leaking gas inside a toilet without having proper intentions to bury the building to the ground. The investigators of Orlando Inc paid attention to every detail and collected all the CCTV footages just so they could find out who did that.
Whilst Marcus was still on the hospital, he was forced to be drugged and put down after he panicked and threatened the doctor's lives. He was in a secured and private room which didn't have so many civilians, hence this provided the privacy he needed and what Diana needed too when she visited him.
Marcus was pale, somber, and clearly on drugs as his face showed every sign of inadequacy. He was in a hospital gown with no shoes and his hair was messy.