Not sure what Delije were doing there to be honest. Delije probably knew that to get to Romania BBB would have to drive through Serbia, which did they. Delije were aware of the road they were gonna take and followed them ... and were Delije go, you know Grobari aren't far behind looking to take on both of them.
BBB are psychos though. They've changed a lot since back in the days. I hate them, but I respected their ultras cause they had great choreos and would support their team to the end, but now all they do is fight and act like morons; throw bottles at their own team. It was only last year they whipped a bottle at Igor Biscan (who is almost like their hero) cause he was having a bad game. Ridiculous.
I won't say that Torcida never fights, we do, we usually go in bare fisted, but choreos and club support is #1 before any fight .... unless we're taking on Partizan lol.
Edit: Just read that some of the Delije and Partizan fans were travellers, but for the most part ... there is a large Serbian minority in Timisoara, Romania which work together with Delije/Partizan fans in Beograd.