Might be some service access we can tap into. They must have back up plans in cases of lockdown or other kinds of mechanical failure.

[Or, you know, he hopes. He glances behind them as the evacuees disappear behind them, then back up at the floating zombies just as the biotic field around them fizzles. The group lands unceremoniously on top of the others below, cracking bones and in one case, impaling itself upon an Eldritch spear]

We might want to thin the herd, first. Can I shoot through those things?