Board Thread:Theories and Speculation/@comment-5407586-20150624095943/@comment-2120712-20150701034846

I think the explosion chakra explodes on contact or when it is in the air so to delay to explosions, Deidara resorted to the kinjutsu that allows him to delay his explosions, almost like he is sealing his explosion release chakra using some kind of forbidden earth style sealing tech. When he undos the sealing with whatever hand sign, the clay figures explode.