Don't get me wrong the Taxi driver was at fault but why does every lycra clad freak instantly claim "they tried to kill me" when they have an incident with an adult mode of transport.
1) Unscrew the valve caps,
2) twist the valve stem with a trusty Valve stem remover (Ebay, Amazon, Local garage) until you can hear a slight noise when you apply pressure.
3)Place small stone inside lid of valve cap before reapplying.
4) Will gradually deflate when driven.
I can envisage see the BBC's report now: 'Video of Asian taxi driver being victimised goes viral'. Quick, call Black (wacko) Lives Matter..