define headbut, did Remy headbut, did Pardew do it as defined below?
"A headbutt is a strike with the head, typically involving the use of robust parts of the cranium as the area of impact. Effective headbutting involves striking a sensitive area of an opponent using the forehead, such as the nose of an opponent. It can be considered a very effective but risky maneuver as a misplaced strike can cause greater injury to the person delivering the headbutt than to the person receiving it".