I'll introduce the scene, however it might be worth working out motivations now. It's in Anna's nature to just try and murder your character if he happens upon her, particularly if he's irritating. However, did you want to have a more poignant reason for combat? Anna could have been the cause of the ship your character was on ending up beached, or he could be searching the beached ship for some reason and happen across her on the beach? It's up to you.