they say like one line and if kisame has to use his tech did you not see his hands in the link clearly manipulating the water which otherwise would not create a shark missile he is not jiust standing there for no reason, and the attack was shown to be fast all there is one line(said by guy) everything else were thoughts. and then the explosion happened and there are no speed feats shown by kisame to dodge anything of that size that fast so until seen otherwise he can't dodge anything that fast. And the reason it was not as fast as instantb is becus it collided against the huge shark missile. guy mentions the tech is instant after he beats kisame, so unless you are saying guy is lying(which doesn't happen often in naruto actually never really happened other than madara lying to sasuke).
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read the whole page carefully my friend they don't even share lines, guy says howl my youth and kisame is powering the jutsu and just thinks not really talks and gets hit pretty fast cos the afternoon tiger went straight through and kisame can't dodge an explosion that comes from it that fast without being heavily injured. And theere was only manga page they didn't wait for it to attack, and read the next page it was extremely big explosion which no way in hell kisame would avoid fast enough and would get injured heavily and much slower after which guy just has to take him out with taijutsu
Show me proof where it is not instant cos even though it collided with kisame's "ultimate" attack it easily passed through to make an explosion pretty damn fast and created a big blast on the next page really fast. so stop thinking the attack is not fast when it actually is. Stop blaming the writer and story just becos the character you like more just lost. It is just part of the story. And only one thing is clear from this you made it clear you "don't want" the attack to be fast even tho it was only one page and big explosion afterwards, not to mention it slowed down by kisame's strongest water tech the shark missile and still was fast.