Malice a forethought is something they have to prove, your right it’s definitely hard to prove .Attempted murder is about the hardest criminal offence to prove, as the jury needs to be sure that the defendant intended to kill the )non-deceased) victim, no such intent to kill being required to prove a murder to the prevailing standard. And the alternative for juries is always s18, which has a maximum sentence of life anyway. It’s not like an acquittal based on a failure to prove intent to kill means a walk out. Anyone guilty of s18 as an alternative to attempted murder is looking at a starting point of fifteen years, will serve ten. That’s a long stretch.
Nothing in that clip looks remotely like attempted murder, but Brazilian law will be different.
Still a bit nuts, though!