Mairu charges forward, the air blowing in his mane as he leaps off the embankment and kicks his feet right into Yue Xin's chest. (hopefully)
(I figure there's no way to communicate with the horse to do non-lethal damage)
Hoof 1 attack (charge, bless, high ground): 1d20 + 5 + 2 + 1 + 1 ⇒ (7) + 5 + 2 + 1 + 1 = 16
1d6 + 3 ⇒ (5) + 3 = 8
Hoof 2 attack (charge, bless, high ground): 1d20 + 5 + 2 + 1 + 1 ⇒ (8) + 5 + 2 + 1 + 1 = 17
1d6 + 3 ⇒ (2) + 3 = 5