Ah, it's a chair. In that case, we can say Anton added a function which turns the stairs to a ramp instead, that would probably be easier. It might take him a little bit of time to adjust the wards, so if you like you can say that whoever is on desk helped Bisi with the steps until then.

Room Ten is a four-share with two kedan in there, so Bisi has a couple of people if she needs a bit of help. It's on the second floor, so only one set of stairs. How's that work?