[David]

I'm not in HR or a lawyer, but my 2 cents from similar issues I've seen:

If the bonus didn't stipulate that it was based on hours actually worked or something to that affect, I'd go ahead and pay them. It makes the firing process that much smoother if it comes to that. Think about when a cop screws up and the news report states that they're relieved of duty with pay. That usually means they're doing everything by the book so they can fire them.