"Someone with a string presence has just entered the room" - strong, hee!
"He slips back into a neural pose" - neutral, also hee!
"painful join lock on his ankle" - joint
"Their disappointment increased when, instead of remaining on the mats, Oyama collects his sword and headgear and steps back outside the ropes." - changes from past to present tense here.

Dang mages! ;)

And now I'm finally caught up, yay! I'm enjoying the story very much :)