The sentries would quickly open the door, placing the black bag over his head and escorting Magi into the base. He would hear a lot of machinery, as well as feel himself descend a bit.

After a good five minutes of walking, the bag would be removed, and Magi would be within a fairly well made bunker of sorts, one of the FF's secret bases. There would be people moving every which way, many armed and not, and signs would direct him to any point in the base.

One of the sentries would offer a warning. "Be civil while you are here, Magi. Over half of the populace is armed. And more than half again are Metahumans, including many of us. Do as you will and go, if you would please." With that, they would simply leave.