"I have been known for it in the past," Sparhawk replies to Martel, trying to match his tone of innocence, but not quite making it. "Although I wouldn't want to make your wife, a widow."

In other words, he's not going to kill you. He won't swear not to hit Martel if he becomes especially annoying. Provocative, as Ewar said. And Martel's expression is highly amusing to Sparhawk, who allows it to touch his face.

"Nice fellow," he comments as Ewar leaves.