Loki grinned, except for the portion of it which was actually a smirk, and then he clucked to Katie, and – up to the point where Sif spoke, anyway – he was all set to ignore her for a little while, instead working on getting used to the horse.
Playful, a little mischievous, under-sized... Yeah, she was definitely the right horse for him.
Walk walk walk, amble, wander, mosey... he was taking her through all her paces, oh baby! All the ones that were slower than a trot, anyway. And he was getting to explore the ring, too. Brilliant.
Or, alternatively, now that they'd established they were about to be bored, they could try a simple, straightforward, shite-I-haven't-done-this-in-a-long-time posting trot.