Luther looked at the targets on the tree and the mannequins then thought, 'Moving targets sound more useful but maybe I should start with the ones on the trees.' As he was moving towards a place seeing the trees clearly, a raindrop made him look to where the classroom's ceiling should be. While he was admiring the Professor's work, he heard Aria and a Ravenclaw (Rajesh) speaking. Luther was surely not interested in walking back to the Gryffindor Tower in wet clothes. Thinking 'Is his thing because of Peeves, too?' Luther stepped away from the Ravenclaw as much as he can.

Then he began casting Arundo at the targets on the trees. The first fifteen or so didn't even get close to the tree, let alone the targets. Moreover, some didn't even reach the tree. But then one got stuck on one of the upper branches of the tree. Then another, closer to the target. Then another one. Finally one was on target. Then few misses. Then another one on target. Deciding it was still too early to try on the moving targets, Luther kept shooting at the target on the tree.