If you're following the view of debate as competition, as combat, it seems like the equivalent of saying "give me five minutes with that wimp, I'd have him on the ropes"

ETA: I imagine my Christian friends being offended if I stood up and said "I think I could deconvert C.S. Lewis, were he living, and willing to give me some of his time".

ETA2: When what I would mean by the comment would be something along the lines of "from what I've read of his writings I would imagine Lewis arguing with me in good faith, with an open and active mind, and with a primary concern for the truth," some of the highest compliments a(n epistemic) rationalist can pay.