Abdullah, Ben, and Caroline are talking to a Drow that they know may prove hostile. Abdullah and Ben are fine with seeing how the conversation goes, but Caroline doesn't want to risk it. As the conversation proceeds, she interrupts the Drow (being narrated by me, the DM) by saying "I attack with my crossbow."
Combat has clearly started, but how specifically?
I imagine since the Drow was looking right at Caroline when she pulled the crossbow, they are not Surprised. Is this correct?
How should initiative be handled? Should they all roll and turn order be established that way, or should Caroline be assumed to be at the top of the order, and have Abdullah, Ben, and the Drow roll to determine the rest of the order?