Why did Bahlika despite being virtuous fight against the virtuous Pandavas?

https://www.youtube.com/watch?v=4CW9Dp8_-AI

Transcript

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Hare Krishna Question why did Bahalika though he was virtuous choose to fight against the virtuous Pandavas answer Bahalika was the brother of Shantanu and he was thus he was the uncle of Bhishma Bhishma was the son of Shantanu and in this way he was actually several generations above the Pandavas so when he saw Bhishma’s selfless sacrifice in giving up his right to the kingdom as well as his right to even marriage and having children just for the sake of his father he was so pleased with him that he decided that he would always support his nephew so when Bhishma because of a circumstantial pledge to protect the to always protect the ruling head of the Kuru dynasty had to fight on the side of Duryodhana then because of his earlier word Bahalika also had to fight on the side of Bhishma which turned out to be against the Pandavas Bahalika was also an extremely formidable base fighter and knowing that he would have to fight against the Pandavas he desired that he get death at the hand of a Vaishnava at the hand of Bhima so when he and Bhima had a fated fight he told Bhima you are like my great grandson and you are a devotee so I won’t attack you unless you attack me and then Bhima and he had a fight and eventually Bhima felled Bahalika that’s how the virtuous Bahalika had to fight against the virtuous Pandavas and he felled at the hands of Bhima Thank you.
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