It's a nice classic SCP, and I can respect that. It's pretty good for something that you coldposted after 49 minutes.
However, I can't upvote because there are a number of inconsistencies here. Firstly, how can the containment team pin down the dragon as specifically coming from Beowulf? The poem doesn't describe the dragon's appearance clearly enough to distinguish it from other dragons.
Secondly, as we know it is copying the dragon from Beowulf, Beta team is improperly equipped to deal with it and the dragon should rightly kill them, since they aren't in the right role. The reason for this is that they are attired in 15th-Century German plate armour - Beowulf was written, at the very least, 200 years before plate armour became a thing, so plate armour should be unrecognizable to the dragon. Ring-mail, round shields and viking-style helmets and weapons are the order of the day if it's manifesting as the dragon from Beowulf.
The poem is also set in Scandinavia and composed in Britain, so the repeated references to how well the entity understands Medieval German culture, while not necessarily nonsensical, do seem a bit odd.