It looks like one of the Polish officers applied a tourniquet to his right arm. It may have saved his life.
All British police officers should be issued and should be required to carry a Combat Application Tourniquet (CAT) and haemostatic gauze on them, a trauma kit in the car, and be properly trained in their use. Shockingly, that is not presently the case.
@PFEW_HQ @PoliceChiefs @ukhomeoffice @ShabanaMahmood