For example, if the initial state of the channel credits both Alice and Bob with 5 BTC out of the 10 BTC total contained in the multisig address, Alice can make a 1 BTC payment to Bob by updating the closing transaction to pay 4 BTC/6 BTC, where Alice is credited with 4 BTC and Bob with 6 BTC. Alice will give the signed transaction to Bob, which is equivalent to payment, because Bob can broadcast it at any time to claim his portion of the funds. Similarly, Alice is also able to broadcast the closing transaction at any time to claim her funds.