You need to have the spell in your spell list in order to use it. And if the scroll is of higher level than you can cast it, you need to do an arcana check (DC 10+scroll level).
So, Sesto can't use it (and he is dying!).
I suggest that Terrus runs out of the southern room and shut the door behind himself. Maybe get help to barricade it.
Bob, should have turned and left the eastern room instead of charging in and playing with the wolfs. There is still a chance he can disengage and leave the room and then Pyrus can close the door magically again (hopefully). I think Sesto is on the inside of the door so it should be ok to close it.
But, hey, Sesto is taking a nap so he can't tell the group what to do. As if anyone would listen...
Still, let's see if we can avoid a TPK.
I must say that I (as a player) never thought the idols could do anything else but be used together to open the vault. I learn something new every day. Also, I need to pay more attention to details... I totally missed that the group received the Identify scrolls.
But here we go...
Let's survive this!!! 