[Kikaifan]

Spoiler for mikuru beam:

Well, since Yuki had to 'immunize' her against the effects of each lense but we only see Yuki rush Mikuru in that first scene, it's safe to say that in the later Mikuru-beam scenes (with effects edited in) she had already been immunized against that particular lense at the time the footage used was shot and didn't create any effect.