Zinovia
Explorer
When I've seen it in play (during the delves at GenCon for example) the barbarian was allowed to take a free action to Swift Charge another opponent after felling the first, whether or not he'd charged that round. It's a free action, and they can be taken at any time, even on someone else's turn. So technically you could take the swift charge at the beginning of the next turn in the initiative order.
How about a case where the barbarian has a weapon that deals ongoing damage to an opponent. He hits the foe, inflicts the ongoing damage, and his turn ends. Later, at the start of the foe's turn, he takes the ongoing damage and falls to 0 hp. Would that trigger the Swift Charge, even though it's someone else's turn? Again, I would say yes. It's a free action, so it can be taken at any time.
I know there has been some debate about whether free actions could be used after a charge, but I see no reason why not. It's the same as if you acted at the start of the next turn in the initiative. The Swift Charge class feature is only once per encounter, so it's not like the barbarian can use this *every* time they take down an opponent.
How about a case where the barbarian has a weapon that deals ongoing damage to an opponent. He hits the foe, inflicts the ongoing damage, and his turn ends. Later, at the start of the foe's turn, he takes the ongoing damage and falls to 0 hp. Would that trigger the Swift Charge, even though it's someone else's turn? Again, I would say yes. It's a free action, so it can be taken at any time.
I know there has been some debate about whether free actions could be used after a charge, but I see no reason why not. It's the same as if you acted at the start of the next turn in the initiative. The Swift Charge class feature is only once per encounter, so it's not like the barbarian can use this *every* time they take down an opponent.