Danny's a good shot. If he wanted to, he could easily hit any target he wants, but this isn't about that. It's about testing her instincts and getting her accustomed to clearing a room. So, when he sees them in the other room, it's Hermione he shoots for, aiming the water straight at her foot before he abandons the gun and bolts, right out the window, sliding for the eavestrough and to the ground, praying -- oh god, praying and praying and praying -- that his knee doesn't give out on him.

Now, it's up to Kate to prioritize.