...But there was a sword sticking out of her. I wonder if catching a glimpse of... a shoe or something as you walked by without making much of it would qualify as discovering the body.

[...This was getting a little too improbable.]

In any case, you and Gundam are in the most precarious situation at the moment. You'll have to be absolutely forthcoming about what you were doing - do go on and smack him if he starts spouting nonsense.