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For starters, this episode went a completely different direction than I thought it would and I actually like that it did! I went into this episode under the assumption that it would be another dark one, with Emu having to accept the fact that there are some people he just can't save.

And then... He did.

I was initially put off by this because well... They were dealing with cancer, a very real disease that kills thousands of people, and yet they just say "nope, Hiiro cured him, Ex-Aid beats Aranbura. Happy ending everybody! Yaaaay!" seems really bad. But then I realized that a happy ending is exactly how the episode needed to end.

Kamen Rider Ex-Aid's main message/theme (so far) is about trying to fight fate to save peoples lives. Having the Emu accept Dr. Shirakawa's fate and not try to find a way to save him would completely go against that message.
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On the less serious side:

The Mighty Brothers finisher is insane. Seriously, the entire critical strike includes:

- A double kick.

- Spinning around while kicking.

- Another double kick.

- A flurry of kicks.

- A double upperkick (an uppercut with kicking).

- Transform back to chibi mode and uppercut the monster into the air.

- Jump up and split back into two riders again.

- And one final supercharged double kick.

If this were any other series, the director would have just picked one of those options and I would have bought that as a decent finisher, the fact that they went with all 8 is jaw-dropping.