Thankfully, Kotaro found the kid and kinda discovered why he is doing it. Kinda discovered since the kid just ran away from Kotaro and try to save his dad again, this time from the MOTW. As for his father, we learned that he is working on some solar cannon, which he wants to use for peace but Gorgom wants it to destroy the city. What's interesting about it is that the solar cannon project is a rejected project, which makes sense especially on the places the kid's father wants to use it, on place where there's barely any sunlight!
More on Birugenia, I just love that he continues his attitude that the three Gorgom Priests are useless without him, and this episode shows us that. Aside from bringing the MOTW who wants to avenge his comrade, he still watches the execution of Gorgom's latest plan from afar and sees if he can contribute something. In the case, he made sure that Kamen Rider can't do a thing in battle because he has the kid in this episode as his hostage. It's a nice plan and we saw Kamen Rider getting hit badly by the MOTW. After the MOTW is done beating Kamen Rider, he leaves with the kid and Birugenia. Since the beating is now over, it's time for Kotaro to look for the kid and ends up falling into one of Gorgom's traps.
What I described above is one part of the episode that bothered me, after we saw how accurate the kid's psychic powers are and how Kamen Rider used it to his advantage, he used the Power Stripes to clean his body so that he can perform the finishers. I mean, he should just use that move earlier and not rely on the kid's psychic abilities! Oh well, at least he defeated the MOTW and Kamen Rider saved the day. In short, the vision the kid had earlier was there so that this episode will have a misunderstanding plot. Seriously, it really feels like it was made so that the episode will feature misunderstandings.