Nice to get on the spot reporting & updates amidst remote conjecture. Nice pics too.
850Kg Jet A1 vented during taxi is cause for concern for all onboard.
Well done TWR
If foam is so corrosive that it strips paint during the incident, do you think H&S would let even a Firey within 100 metres of the stuff, let alone spray it in strong winds or wade through it? What you see is mainly air & water (foam).
Even if spraying down the intake did wreck the engine, still cheaper than total airframe loss by fire on an active taxiway, methinks; not to forget the pax compensation claims!
Well done to all involved