Too late for the boar to avoid it, unfortunately. There's the painful, meaty sound of impact to flesh and the boar's scream of outrage is more of a gurgle, the hit halting his ascent and sending him reeling downward. Apparently, it takes concentration to maintain that ability to stride on air, and the hit has disoriented him enough that it will take him a moment to find his feet, catching himself before he can smack into the pond and shaking his great golden head.