As I type I am sat in the bathroom with four buns mid bonding!!
I would suggest you get all the bits in there for your own comfort.. I have my dinner (I know its teh bathroom but I need to eat!!!) and laptop, drinks, phone etc... so I dont have to leave.
As for buns I have lots of boxes and tunnels (with 2 exits), 2 litter trays, food, water and oven gloves.
They are chasing and ippig but no real fights so i'm leaving them to it. Only if they grip on shoudl you saparate teh fight... but try to continue teh bonding until they are happy in each others company.
Make sure its a relatively small neutral space and that everything you put in is cleaned esp litter trays... and just be patient and let them get on with it.
Have a look at my post if you want to see some of my panic/issues/pleas etc lol (bonding four - begins today)
Have they been together before? May be a lot easer for you in that case.
Good luck with it all!!!