Bob, a merchant seller, had contracted with Acme U.S., to buy welding equipment. The contract stipulated that Bob would pick up the equipment from the Acme U.S. warehouse on the 14th day from the date of the contract. But Bob could not make the pick up on that date and before he could do so on the 15th day, the warehouse was burned down by juvenile delinquents. In this situation, who bears the risk of loss of the goods that were to be received by Bob? Explain the relationship between the parties under the Uniform Commercial Code in your answer.