Losing an army HQ-Oh no!

[Green]

So really if I wanted to be a total asswipe, the smart thing to do is just isolate the HQ unit and leave it surrounded but not kill it?

Not sure about that. I think an Isolated HQ can still be In Command and still has it normal Command Range. So I guess it depends on the situation but normally leaving it surrounded would not be a good use of your units.

Edit: On reflection, ignore my comments above. I assume the HQ is Broken so it will have a command range of zero.