Yeah I noticed that too. Could have been funny to see the guy quickly unbend it with physical strength or something before retaliating or something. The fact that it was just magically fixed is just wrong.
I tried to brushed it off that the bent handle was just not apparent to our eyes due to the dramatic distortion already made the glaive looks so curvy it almost becomes a crescent. Copium, I know, but it helps me keep my sanity.
When did Yoko Yoko get there?
Just now, duh

Seriously though, if Yoko Yoko is here, who keeps Shin occupied? Will he also teleport here?

(Probably not; taking two generals' heads in succession will be too much even for Shin. It'll mean he just one-man winning this first war or the whole campaign even)