I am a bit confused about the changing costs sections of the comprehensive rules:
Player 1 attaches Kumade to a personality that has been targeted by Hired Killer by Player 2. According to the comprehensive rules when it comes to paying costs:
At this step, an action’s mandatory costs, and optional costs in the constraints block, are paid. If paying an action’s mandatory costs is interfered with between announcing it and this step, no effects of the action resolve; the ability is considered to have been used; and the action is considered to have been taken, but not resolved.
but there is also this section:
If any specific payment of a cost is negated, delayed, or made impossible in the process of paying costs, the player paying the costs may use alternate available sources to pay that cost, or may choose not to.
and this:
Costs must be payable when an action is announced under the Good Faith Rule. If, due to interference from other effects, a mandatory cost cannot be paid at the point when it must be paid: • No remaining costs need be paid, but costs already paid are not refunded. • No effects of the action or trait resolve, and the ability or trait is considered to have been “used.” • If the cost was for a card to enter play, it is discarded.
Therefore which of the following is correct:
Player 2 has the option to pay additional gold to meet the increased cost of Hired Killer even if he has enough gold available to pay the increased cost. He does not have to pay anything for the Hired Killer if he decides not to pay the additional cost. If he chooses not to pay the additional cost Hired Killer is discarded.
Or
Player 2 must pay the additional cost of the Hired Killer if he has enough gold to do so. If he can't pay the cost he can elect to pay nothing and Hired Killer is discarded.
Or
something else happens (grateful if you could explain)
Would the situation be the same when using Turn of Fortune to change a target to a more expensive personality?