The only exploit involved abusing your intelligence
And it is. TB/RT is map setting, and it's set only when map is created, basing on settings of map "owner" - and it's never changed later....but if you want to make maps keeping TB mode active until last player exits the map, then it's terrible idea.
Chi si ritira dalla lottaE' un gran figlio di mignotta!
Then might be a bug, or maybe he used all his AP so turn ended immediately, and with it combat, and with it he could run again.