A GORY video fanatic killed a gran by stabbing her 18 times as she waited for a bus in a random attack, a court heard. Jala Debella, 24, allegedly carried out the “senseless attack” on Anita Mukhey, 66, in North London, at around 11.50am on May 9, 2024. Afterwards, Debella “casually” walked away as passers-by…