After noticing a red circular mark on Will's face I asked Thomas what happened to his brother's face. Here's pretty much how our conversation went:
Mom: "Thomas, what happened to Will's face?!"
1st answer: "Will falled down."2nd answer: "I hit Will with a stick."
3rd answer: "He bited hisself."
Final answer: "I bited Will, but I said sorry!"Then Thomas proceded to kiss Will (on the opposite cheek) to make it feel better. It was a sweet gesture, but let's just say Thomas didn't get off quite that easy!!