Some shows have IT and some shows don’t. And last night’s show never even came close. Aside from standout, but structured, versions of “Stash” in the first set and “Bowie” in the second set, there was no improvisation to speak of in Amherst’s second show, leaving many fans scratching their head trying to figure out what happened Sunday night and why. After a song-driven effort on Saturday evening, Phish came out with zero intent last night, seemingly happy to play a benign list of singles with almost zero creativity. Every tour has a speed bump – a low-point – and without question there won’t be a less engaging show this fal