Apparently, right after Yuya performs his show of Pendulum Summoning, Reiji reveals that he can do it as well. this leaves our protagonist speechless.
Luckily, the Scales get changed to 2 and 5, and thus his Monsters get destroyed. Wait…how did this happen? I looked up the Monster effects on the…
Gonna put my two cents here, animewise Galilei and Kepler Monster Effects (or at least, the ones possessed by their prototypes, as Reiji called them) had to be something like “During each of your Standby Phases, this card’s Pendulum Scale is doubled/halved” - that would explain why they went from 1 to 2 and from 10 to 5 respectively. Furthermore, in the anime the effect for cards such as Odd-Eyes Pendulum Dragon differs from the original (in that case, for the “level 5 or higher monster” clausal), so it is very possible that the anime-counterparts for those DD monsters can differ in effects as well.
ＨＥＬＬ ＡＲＭＡＧＥＤＤＯＮ ＴＨＥ ＧＲＥＡＴ ＤＥＡＴＨ ＬＯＲＤ