>> I think I'm confused as to which risk we're assessing;
>>
As you say, the key risk is that a powered vehicle can run away. The mitigation for that is that it's properly immobilised; brakes on AND power switch off/keys removed. Failure to observe those and you're on a one way ticket.
If, in this case, that was not observed and something else like a dropped bottle was involved then there may be another stable door to bolt.
Once it's running round like a demented thing and approaching an airliner then action taken looked reasonable and indeed it looks as though vehicle chosen for 'intercept' was something big enough to do job properly - is it my imagination does it have some kind of plough on front?
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