I’d say tiny slash and/or small grapple. depending on how much choice you want. you could of course also add some penalty or bonus to the grapple, not that grappling at a distance is great a bonus in itself, of course there could be a bonus to the slash too, or just tie a knife/dagger on the end and wha-bam you could, in my opinion, go for perhaps a small slash.
It would also depend on the whip I guess, the standard Indiana Jones whip would perhaps be something along these lines, not that whips are at all my area of expertise (contemporary theatre on the other hand!).