If King Harold had minded his own business, and not looked to see what you were doing landing in the battlefield during the contretemps with Monsieur William, he wouldn't have had his optical sphere punctured by a stray projectile fired by a careless archer. The surprise of seeing a gasboiler arriving in the battle probably caused his eyes to open much wider than normal, (under such stressful circumstances,) so that they facilitated the entry of the offending offensive instrument of wounding.
