Board Thread:Episode Discussions/@comment-36098737-20180706133115/@comment-1512913-20180706133915

Because it's just Tsunade's imagination as she is reading Jiraiya's book depicting those events, while being trapped in a genjutsu. In other words, everything in that little arc is double fiction. Foremost, Tsunade is in a genjutsu and the events you speak of are fiction written by Jiraiya that she is reading within said genjutsu.

How about you watch the episodes with little comprehension?