It's in that moment that he notices that Lan Wangji has a companion. In fact, his eye is drawn to her immediately; it's a little hard not to be, what with how she looks. Red skin and horns, pupil-less eyes; can he really be blamed for the way he yelps, stumbling back a step?

Unfortunately, he is in very wet, heavy robes that go all the way to the floor. His foot catches on the back edge and he starts to fall backwards, arms flailing, landing on his back on the grass with an impact that momentarily knocks the breath out of him.