Whatever it is, the white membranic mass of the Village Guardian offers no resistance. And whatever No.6 does get up to, it nearly always attracts a crowd!
Here No.6 appears to be hiding, or skulking behind Rover for some reason, but what is there more to be afraid of in the village than Rover, and why should No.6 be skulking about remains a mystery. Whatever his reason No.6 seems to be completely unaware of the attention he has attracted. Perhaps they are waiting to see what No.6 does next!