[ Watching his two young charges splash around in the shallow end of the river from the shore of the beach, Saber doesn't notice the other Servant immediately. In fact, when he finally does sense the other Servant nearby, he's actually very surprised because it feels like the presence just appeared. He turns away from the river, surveying the beach and scanning the people gathered around. He doesn't summon Excalibur on account of the innocents, but he's prepared to if it proves to be necessary. ]
Option 2