If the seal was done correctly, no black magician could enter the room. But if the seal was broken by you for having physically stepped out of it, the best thing to keep back the wolves is to conjure!
Joyful in hope, suffering in tribulation, be thou constant in thy prayer.
Benedictis, qui venit in nomine Domini. Osanna in excelsis.
"Blessed is he who comes in the name of the Lord. Hosanna in the highest!"