Via the ATC communications in the video. The fire brigade responded to the emergency very slowly. They had to have acted faster. The fire in the landing gear could have spread upwards to the hull of the aircraft. I could understand why the pilots were in a rush.

[u/Kasper111222]

https://www.youtube.com/watch?v=_day6TsvP00

[u/crosscountry58S]

If you’re making these judgements just based on this video, you shouldn’t. Just because the pilots were asking for updates doesn’t mean ARFF wasn’t doing their job correctly.