@Hyperkinetic:
When it comes to Virgos' stick event, his hand was black the very first time we saw it and before he shows any more effort than revealing a stick from behind his back. When he does start to put effort into putting the smack down on Law, he strains a bit and then says "SWAP", whereupon the black spreads to his sleeve and stick. That sounds to me more like some fruit ability we have not encountered yet, rather than generic haki.
http://www.batoto.net/read/_/110672/one-piece_ch672_by_mangarule/4
I'm curious what the sound effects are in the 3 'stick' frames. Looks almost like n"n" in the last panel. Whatever, I'm sure we will find out which is which soon enough.
Aohige_AP translated the sound effects in the last panel
@Aohige_AP:
I'm not saying you're not saying she's not saying he's not saying either.
I was just taking a crack-shot at the velcro-man idea, because that's funny as hell. I love it.
On the more serious note, to answer someone's question a few pages back, the sound effects in the scene where the bamboo turns black is
top portion: gu…gugu.... (sound of something growing, in this case, the staff getting longer, obviously)
bottom: kachi-n! (sound of something getting really HARD. Like a rock or metal)