If you still want a meet-up, from what I read, Horace's looking for a drink and Jack's leaving a tavern to reconvene with his captain. As far as Jack knows, one stray shot is nothing to be alarmed over so the meeting might shed some light on the severity of the situation if nothing else.

EDIT: Alternatively, Pie said the boy disappeared into the crowd; it wouldn't be out of the question to think he chased down Horace next if you'd care to stick to your original plan.