People did really love to group Shin into little class groups, pretending that they know the extent of his abilities from his attire. To pretend that Shin were a monk, to pretend that he were talented in just one manner of martial art, would be ignorance of the highest order. This assumption had lead to the deaths of hundreds, and likely would add another death this day.

As Corban swung her second spell, itt was almost like she was intentionally pitching her attack right into his weapon. She had done it right at the beginning of his swing, the moment where he was still facing her and he had put his weapon between them. You know, that exact moment that he had been planning for and in fact had very little hope that it would play out in that manner. 

Yes, it did indeeed parry away Shin's bladed staff. Though this was what he had intended from the beginning. Upon contact with the spell's edge, his staff began to close around it like a venus flytrap on prey. It pushed his staff up and over, Shin's left hand was already extended in preparation for this, it swung upwards and struck against the base of his palm and rolled over the edge. Shin grasped it with his open left as it rolled downwards and flipped it back over, turning Corban's parry into a counter-parry as the reverse end of the staff rose upwards into the oncoming swing. He gripped it with his right once again after he had previously released his grip on it, raising his hand upwards sharply into her swing. 

His spin had been totally interrupted by the contact and he had some significant angular momentum thrown in his corner so he did have to stop it. By twisting his hip and sliding his left leg forward at an angle, he dug his heel into the ground and halted his forward motion. This cessation of motion and upwards counter-parry would knock his staff right into the groove beneath the blade of her polearm. This would normally be a problem, as a spear wouldn't have any excess material and would simply slide up his staff and into his hand. However, due to the strange construction of Corban's own weapon it would lock into place directly onto his staff. 

This combined with a groove that formed mid swing, would bury her weapon inside of his. This would give him control over both of their weapons and parry her blow in one fowl swoop. 

Let's not forget the crystallized air. 

Shin hadn't failed to notice the explosive result of the return from solid to gaseous behind himself. Once the spell and staff had made a total rotation, and the fluid motion of his swing had completed, he opened the rear of his staff away from himself. Venting the expulsion in a thin and powerful stream off and to his left.