Prayers about biting

Hayden was saying his prayers tonight and part of his prayer was, "help me to not bite my brother".  Now, we've never had a problem with any of them biting the others, so this was definitely a little shocking to me. However, he just kept praying so I kept on listening.  Then he said, "Amen", and a bloodcurdling scream filled the room.  Eyes now wide open, I looked up and see Lucas leaned over the headboard of Hayden's bed and Hayden's was yanking on Lucas' hands.  Apparently, he had been making pretend "spiders" with his fingers over Hayden's face while he was saying his prayers.  Thus the prayer to not bite his brother.  Prayer time will probably need to be done with the lights on in the future and with my eyes open.  Ugh!