I'm currently posting this with TornTools enabled.
At the end of an attack after defeating an enemy, a 30 second timer begins while the attacker has the choice of Leaving, Mugging, or hospitalising their opponent.
This timer does not seem to be taking effect unless the person has that tab active. Here is an example (resulting in a chain timeout), of the fight not registering for 36 seconds after the final hit is made.
While in this case it might be argued that I was on another tab, what happens if I closed the attack tab instead? Did the attack even happen? Given that allowing the post attack period to time out is a well worn chaining strategy, is this a bug?