Sal's really comtemplating his situation. The Leones have only just dealt with the Sindaccos, but now they're fighting in Hepburn Heights and losing men. You need to help them. There's a weapon and some armor in the garage if you need it.
We're Fighting A War...
Now, you have a Diablo and Leone counter. You need to empty the Diablo counter by killing them before every last Leone gets picked off. There are many pickups if and when you need them. It's pretty simple as long as you're covering for some Leones. After you've finished off the Diablos, you phone Sal and he's adamant that the Leones are taking Hepburn Heights.