The man's heart finally settled down.
He had fled the building corroded by the Subspace Shadow, fleeing those terrifying mirrors and the burning flames, and arrived at a gathering place watched over and blessed by The Saint. Trusted comrades surrounded him now, the flickering lights transmitting a comforting power while like-minded individuals gradually dissolved all his panic and tension.
It seemed that nothing frightening would happen.
Thus, the man in the black thick coat took a long breath, then picked up the cup of water Duncan had handed him, ready to moisten his somewhat dry throat from all the running.
But just as he picked up the cup and saw the rippling water, he felt a bit uneasy, a vague anxiety rising from the depths of his heart, so he put the cup back down.
Clearly, this was a "hangover" from the previous terrifying experience. He figured he'd better not touch any drinks in cups for at least a few hours—if really necessary, he would find a straw later.