Cromwell pauses and reconsiders his doubtlessly fatal charge. He takes in the situation, puts away his mace, and looses his shield. His thought process runs something like this: His job is to guard the town and its environs, and those that people them. The ogre lives in those environs. The ogre is under his jurisdiction. And since the ogre is not immediately hostile, he deserves protection and respect. It's more than a little convoluted, and the logic is questionable, but it provides him a framework to view the interaction in.
Having thought that, Cromwell, approaches at a walk towards the Ogre. "Can you do anything for the knight, sir?" he asks politely, showing as much deference to the ogre as he does to any commoner he meets in the street- that is, respectfully but authoritively.