FWIW, chatted to one of my mates who works as a firefighter for Aena. He said he was unaware of this incident in Palma, but he said he was not surprised the captain was "climbing up the palm trees. He can say adios to his engine".
He added: "what they 'teach' us [his quotes] in Aena is to let the aircraft fire supression systems have a go at it first, then if that does not work, we try with the PQS [whatever that might be], but if the fire is still going and there is a risk to the aircraft or its passengers, then we attack the fire using all means available. [....] A foam party and a requiem for the engine"
So there you go. None the wiser really.