So sasuke has two blood contracts now? One with the hawks and one with the snakes? C'mon get off his dick....he's sittin there sizing up naruto like he can do something?! Stop it.....just stop.
Did they ever explain that? When would he have signed a hawk summon contract?
In the chapter he does it in EVEN Tobi says "when did he get that?" It was literally right in the middle of the battle with danzou. Danzou knocks him off the bridge with a jutsu and instead of falling to his death kishi uses plot device no jutsu to save his ass