On one hand, in this context it makes more sense, considering that Jima could also benefit from Mogan semblance since it goes both ways. On the other, precisely because Mogan semblance can be exploited even by his opponent, that kind of defeat your purpose, no?
Anyway, if you insist let's do it with semblances then. In just for training in any case and can be used for future references to justify good teamwork.