[he instinctively plants himself at Wei Wuxian's "back," natural as breathing, and reaches out to anchor him against the pull. he doesn't have much time to analyze the dynamic because he has to keep whistling, narrowing his eyes in concentration and walking out fearlessly among the ghouls. making Wei Wuxian hang onto them longer than necessary is counterproductive.

he's looking for HEADS or PLACES LIKELY TO CONTAIN HEADS]