Board Thread:Versus Debates/@comment-26537507-20160118182432/@comment-25093611-20160120092014

^maybe the reason is because explosion release is at 50:50 with both elements and if someone attacks it via lightning release it will cause the explosion releases mix to become a 51:49 in favor of lightning, therefore it becomes useless :I

at least this seems to be the most logical explanation for me :)