Response to who shot ya, riot, la la...and I have no idea what it is that Jay did to get dissed specifically. Faith was dissed because she told Biggie about it and they used that same look no further.Pac literally said why he made Hit Em Up and it wasnt just about Biggie "setting him up". Honestly. Hit Em Up was a RESPONSE track to Who Shot Ya. Which is why he said "Who Shot Me but ya punks didnt finish, Now u bout to feel the wrath of a menace...". There was DEF a purpose and goal for Hit Em Up, and he achieved it.
Pac didn't even say "who shot ya was definitely about me" he said that even if it wasn't dropping it right after he got shot was in poor taste. I think the other things were
1. Biggie and Puff publicly acted like they supported Pac and they didn't visit him or nothing
2. Biggie's ready to die...was very similar to Pac's original version of matw that he pretty much had to scrap
3. The possibility that Biggie may have knew something was going to happen but didn't say anything.