Re: "extraordinary" and "bizarre",
"A psychiatrist...speculated the German man might have been suffering from depressive episodes"
If he is speculating rather than offering a professional opinion, that suggests he isn't the court appointed psychiatrist or an expert witness and hasn't met the man. The DPP wouldn't prosecute if he didn't pass an examination for fitness to stand trial and any defence counsel would produce evidence of mental illness if any was found by expert witnesses.