Right. Right. It's not like he'd forgotten that his Patronus was a lion, it's just that, when confronted with the aforementioned rather large and carnivorous mouth, not to mention the total lack of silvery air, he hadn't put two and two together.
"They're not exactly what they are either, though," Pete said. He pushed his door shut behind him and watched as the (his?) lion jutted its jaw forward for William's mongoose's inspection. "I mean. Your mongoose is basically a snack for my lion, but." He shoved his hands in his pockets and shrugged, nodding towards the total nose-thumbing at the food chain going on in front of them.