They won't realize the distance deidara is keeping from it..He's a aerial fighter, the won't even think thats the reason he's up there......The only reason sasuke could , is because he can see the cloud of nano bombsmadara's meteor
c4
chibaku tensei
tsukuyomi
amaterasu
daytime tiger
kamui
kakuzu&hidan's combo (which was never survived before kakashi)
liger bomb
gaara's technique where you bury the opponent 200m underground and he's unable to move even a finger
orochimaru's possession technique
all these are 'unavoidable' one-hit kills/unavoidable match winners. all of them have been survived and beaten.
c4 can be survived simply by maintaing the same distance from the bomb that deidara is keeping from it (if no one manages to come up with that idea they're one stupid team). yeah, some techniques are less avoidable than others, but it's just a matter of degree. and how often do these techniques win the fights? people win fights with normal avoidable attacks as often as with huge ones. and often smarts have much more to do with getting the victory than the jutsu you use, esp with evenly matches/high level opponents
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And he saw deidara hovering over it