Re: maliciously possessing an explosive substance
Which would have been his breif's argument too. It would appear to have failed. Probably on the arcane point that the miscreant THOUGHT and acted as though he was in possession of a live explosive device.
If you point a replica firearm at the police regardless of whether you know it is a replica or not they are very likely to shoot you.
Hell, being in possession of a table leg and a Glasgow accent can get you shot dead in London.