The School Run

Red is waiting for a child outside a local Primary School at throwing out time. I don't think he came on his own, because he was secured by a lead to the railings. There was probably an associated adult human somewhere about, but neither he/she nor the child was in evidence, and Red was being very patient, and - dare I suggest it - a little worried.

Can you spot the hidden "500" in the blip? No, nor can I. It must be too well hidden! [The truth of the situation is that I didn't realise it was my 500th blip. Maybe I'll try for a special 501th.]