EW says
On this week’s episode of The Walking Dead the long simmering relationship between Rick and Shane finally became physical. No, the show’s central love triangle did not become a ménage à trois, as much as that might have pleased slash fiction devotees. Rather the pair beat the hell out of each other in what I’m going to call call “The Jackpot in the Parking Lot.” (Okay, that’s garbage. Oh, where is Don King when you need him?)
The Significance of the 2 bodies that didn't have any signs of bite marks seemed a little strange to me as well. I hope they delve deeper into this revelation.