That's not how I read the details at all....looks to me like the non-Asian guy in bed with the woman is the odd man out here....the guy walking in looks to be the one that actually lives there and the weapons on the wall are most likely his.....so he'll catch his woman in bed with this other dude, and the battle shall be joined. Besides....the weapons are closer to the guy walking in, than the guy in bed....so the surprise will be his wife in bed with another man, at which point he'll turn around, and grab a weapon off of that wall. But as an American, I will defend to the death your right to be wrong.
Interesting outlook you have on this in respects to this hilarious debate I must concur BUT what if he walks in and slips on the oh so neatly placed flip-flops...this I think will give the other side the advantage they need to hop over the fallen guy to then reach for the mass array of sharp objects on the wall. Also wait I grabbed yet another intricate detail please take notice to the bottle of expensive wine sitting on the table this is yet another advantage for the two on the bed. Also another far off thing I've grabbed is it's two vs. one......
