Typically the term is "Hats Off!" but Umekile wears both a cloak and a hat and each one is synonymous to him. So I went with the bigger item of the two.
His long mane falls slack and his right hooves dig unto the firm earth. The air pressure dropping around him whilst a powerful surge builds within him. His wonderful, gold-lined cloaks flutter to the earth; Hat's off my friends. The sorcerer has had enough.
In the blink of an eye there is silence followed by a bright, flashing light; a beam streaks through the arrow followed by the rattling CRACKOOM!!