I was about to call him on it when he blurted out his excuse.
"I thought it was Gregg's." He glanced down at the clearly marked tanks and blushed. "I always check his gear before his dive."
From the gauges, someone had already refilled all the tanks. "Nice of you," I said.
A shadow fell over us, MC entering the shed and, in that same moment, Martin hurried to the door. He glanced at me in a hasty and nervous way before exiting, the dive leader not even noticing, head down, focused on the afternoon ahead, likely.