Whilst it may have been a mine (84 had a Beverley temporarily disabled by one 'up country' in Aden ) it could just as easily have been just the tyre exploding. As my fading memory recalls the USAF have lost several C130s to just such an event. On the OCU when doing several rollers in succession it was the SOP to leave the dunlops dangling to cool the brakes and the tyres. The hyd systems (utility and booster ) are pressurised to around 3000 psi and any rupture of the lines caused by a blowout or brake explosion causes highly flammable vapour to be ejected giving a blowtorch effect. No authorised amount of fuselage carried portable fire ext would do much good in this instance.
Glad to see all survived. (I take it as read that the LOX tank is empty and purged on these sorties !)