This is very tenuous but I was trying to connect Death's Duell the title of a sermon by John Donne with James Howell an author from around the same time. Have a Google and see what you think.
Not certain of this but James Howell was injured when separating two friends in a duel. I think there may be a reference to this in his Epistolae Ho-Elianae, but I can't open it up as it requires a subscription. If he did mention it he likely would have used the same spelling as Donne and Lovelace - duell.