The jury wont be spending much time on what Warriena did to instigate her own death.. This is merely for the public to chew on for as long as they wish to, and was no part of the defence that Warriena was suicidal at any time during the evening's encounter with Gabe. At no stage has Tostee claimed that Warriena was suicidal or murderous, for that matter. His claim that she was ' psycho' doesn't have a lot of bearing as he isn't qualified to judge that, in any way, and had his defence relied upon Gabe's claim, then the Prosecution could have bought in a dozen people Gabe had called 'psycho' ( most likely mostly women, but not confined entirely to women ) . Just the mere hint that this expression was common usage in Gabe's conversation would end that unlikely medical diagnosis performed by Gabe under pressure.
Tostee's claim to his father that he was being ' beaten up'. .. apart from the jury being asked not to consider that, Gabe's own Dad didn't think Gabe was in any way injured even slightly. .. he offered to take Gabe to hospital, but only for shock. Dad didn't say, my god, Gabe you've got blood running down your face, etc.. Dad didn't notice a thing from his son about being 'beaten up'..