Running is an option. Running also feels like he's losing this battle here, however insignificant and petty it seems. He continues to walk, though his steps feel deliberately slower.

He grunts, but he doesn't seem to have much of a retort to that. Slowly he starts to shrink, the black tendrils of smoke whipping lazily around him as he dissolves completely. With a burst of speed, he puts some distance between him and Dave, changing course and heading towards the storage building.

While it seemed like he was running, he wasn't making that much of an effort to lose Dave as he's still within sight.