Gabriel managed not to flinch, but it was a close one. He kept his head down, one hand half-out, the other on the wall, and taking odd sliding steps to make sure there was nothing on the ground in front of him. It took a while for him to answer.

"I was trying to build a reality-pocket safe," he said in a low voice without looking up. "Since--my constructs and all." It was just the next step along. One good thing about talking to Aziraphale about it--he wouldn't have to spend too much time in explanation.