you were walking in the Omega Timeline, and saw a Sans wearing black garments and a forest green cloth on his neck, the hood up with a black mouth mask, is on the ground, on his knees, covering his mouth as he coughed continuously. apparently, the green cloth is a scarf and the end of a turtleneck.

cough cough "O-Oh, God.."

he spoke in a high yet slightly strained tone. as if he was holding another cough in his throat.