if you look closely here he is doing some kind seal and he is doing it very fast and hes hands are hidden , which means it is ninja technique(ninjutsu)... tobi is kekkei genkai, he can probably he wants to it with one hand really fast...


watch here he did it something quick with his one hand probably ninjutsu, then he go back to the tree look at point where he was...



and when u look here he just teleported from point where he was standing front of the sasuke and then he just come back to his own body again...

why im thinking this cuz itachi said that he is invisible...


madara is using some kind jutsu like meisai gakure no jutsu ....


it is something like this, it gives you invisibility and u can teleport, but madara has much better and advanced technique...

so he can hides himself close to his (fake) body , he separate his chakra somehow creating hologram of himself which means (chakra with hologram) just to trick his enemys, i think they should not try hit him direct, if he is invisible they must find a way how to sense him to see him... if it cant be seen by byakugan and sharingan it means only good sense can track him...

and thats how he can be defeated...