Being of some capping renown, I'm quite qualified to weigh in on this issue. With the current grenade hitbox, and the current grenade explosion radius, it should be simple to readily hit ranged combos. I imagine it'd take you about an hour to learn, Rags. You would then have two chances to block cappers, or even the ability to block multiple cappers from multiple angles. Now were these combos difficult to strike, these new abilities would simply increase skill differential – a good thing. As it stands, though, I think they're made all too easily.