I really don't understand the SPMA. I know what the normal fire mode is - it just fires an artillery shell towards where you aim. But I don't get what alt-fire does. If I do alt-fire, I can see where it goes, so that's fine, but if I click it again, before it explodes, it just stops and I get a green thing. What's this?
Can someone please explain what the alt-fire does in the SPMA? I think it does more than just show where you aim, but I don't know what .
Thanks