The articles by the Times of India and the Press Trust of India confirms that the fire tenders were set on fire but not the firefighter.
As per the article by The Times of India, three fire tenders which had been sent to douse fires in Gokulpuri were attacked by the rioters midway near Brahmpuri. The firefighters had to flee from the area as fire tenders were set on fire. This was confirmed by a senior fire officer who was overseeing the firefighting operation at Gokulpuri market.
According to an article by the Press Trust of India, a fire tender was pelted with stones and another was torched by the protesters in northeast Delhi.
The above sources confirm that the rioters set fire to the fire tenders and not the firefighter.