Board Thread:Show-Related Questions and Answers/@comment-61573-20160906121308/@comment-61573-20160907140803

I watched that episode to make sense of it in context.

According to the dialogue, Mulan observed Phillip in Yao Guai form for a month, but didn't know he wasn't an animal.

So how did she apply that experience to Red?

Unless she analysed it later in her mind and realised that certain patterns of behavior/movement indicated a transformed human, not a real animal.