The way I understand it, it was Tachibana who took away the Meteor henshin in the first place. That's kinda unfair.
I'm getting confused by Tachibana's motivations. At the start it seems it was his idea for Ryuusei to don Meteor and do whatever it takes to use Aries to save Jirou.. Now it (1) made that test where he would rather that Meteor save the KRC instead of getting to Jirou and (2) he took away Meteor's henshin after Meteor laid the smackdown on a kamen rider who can't even turn his head.
Can't wait for the next episodes. This one has a much darker mystery than OOO.
EDIT: Oh, and I just remembered. The English teacher actually used the "IMPOSIBRU" meme
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EDIT2: Now that I think about it, it's possible that Tachibana may be related to Gentaro. Either his father or someone who knew his parents. Before he learned about Fourze he had this Machiavellian approach to things, but then turned around when he saw what Gentaro was trying to do.