Hi! I am very sorry about your problems. Have you still got stinky bedding from your old home? Guinea pigs need to re-establish their hierarchy in any new new territory, so if there are underlying conflicts, these can come to the fore during this time. It is one of the few occasions that adult boars can fall out.
The more you can keep the cage the same (including using soiled bedding to keep their new home smelling "right" at first, the better).
If necessary split them for the night and then conduct formal intros on neutral ground tomorrow.
Here are other tips:
Boars: Bullying, Fighting, Fall-outs And What Next?
