If Gaius sword was meant for slicing horses, all those times that Arthur took it head on, his sword should have broken and his body crushed, but it didn't. Realism is simply not important in this show. What made that fight look idiotic was, Gaius was completely overwhelming Arthur, then all of a sudden, he dies. How difficult would it be to replace a few of the Arthur bashing scenes (while I like them) with scenes showing him slowly gain the upper hand?