Leon goes hushed as soon as something seems to get Ylva's attention, following her gaze. He doesn't see whatever it is that she's picked up on, but he nods and takes a brief moment to check over his gun, making sure it's loaded before cocking it and getting ready to aim and fire.

Focused on that as he is, he almost misses the moment when Ylva shifts shape, fast and seamless and nothing like any of the grotesque transformations he's seen in the past. He knows she told him she was going to do that, but, wow. It's one thing taking someone's word that they can shapeshift, but another thing entirely watching it happen.

To his credit, he only stares for a moment before getting back to work, getting his feet and shoulders squared. Whatever's going to come out of that bush is likely going to be small and fast, which means he'll have one chance to make a very good shot.