[Under different circumstances, he might actually try to herd, or say something, or you know, at least attempt to make it clear that Shinichi needs to be out of sight when he's suddenly his normal size/height.]

[However, the sad realization that he's probably going to have no problem getting Shinichi to follow him makes it that much easier to go with the fight or flight instinct and dash for the dark space he'd just caught sight of.]

[This may not be his most well-thought out, cunning, and brilliant plan ever.]