Maybe the Iranians smoke weed like the Afghan Army do when fighting alongside the British in Helmand...
As was shown on TV, the weed smoking Afghans stood up and stayed up firing in full view of the Taliban afterwards to the amazement of the British.
Perhaps the Iranians have the same 'head on' when going about their daily jollies in the Persian Gulf.
With the communications intercepted "We are coming at you, you will explode in several minutes" it wouldn't surprise me one bit.... sounds like they could have been on something just to say that sentence!