Buffalo Bills -- Line Coach On Paid Leave ... After Allegedly Punching Boy

The Buffalo Bills are distancing themselves from offensive line coach Aaron Kromer -- putting him on paid administrative leave after he allegedly beat up a young boy at a beach in Florida.

As we previously reported, Kromer was arrested for assault and battery after cops say he punched a boy in the face on July 11th during a dispute over beach chairs ... and then threatened to kill the boy's family if he told anyone about the incident.