What you hear is the exhaust leaking out between the head and the header pipe. The broken bolt should pop right out with a EZ out bit. Other than getting new stud(I'm not talking about replacing drewpy) and a new nut, you should be ok. Should be a very easy fix.
As far as damage from riding? Probably none since it was such a short distance. But continued riding could result in a bent exhaust valve.
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