Tal wants Foxhound's pentouse warded first to make working easier and have somewhere to stick essential personal, then warded suits for dealing with this type of attack will be built, then the wiznerds will be warding the complex itself section by section. Starting with the area surrounding the Gate Wing cause that's the most probable source.
"Oi. Security Dispatch. Lock down Debrief Room G-032 and all surrounding hallways and rooms. Hell. Lock down Gate-001 and seal the vents as well just in case. Some idiot brought a Malignant Entity home. Security Team C031. Do not under any circumstance enter G-032. You will die painfully and your souls will likely be forfeit. Stay put and guard the doorway at a range of fifteen meters. Assume all members of Gate 037 to be dead or possessed. They are not to leave that room. If something horrific comes out, open fire. Don't stand there and shit yourselves. When Fight or Flight comes up, pick Fight cause ya won't have a rats chance in hell of escaping."
"Sec Dispatch, keep me updated. Countermeasure is under production. ETA twenty minutes for the first set. Recommending arming all security personal with both lethals and nonlethals. Disable and restrain anybody acting abnormal outside of the current symptoms of paranoia and jumpiness. Should any personal begin visibly mutating, attempt to disable, should that prove impossible, terminate. Essential Personal are to report to Foxhound Dorms in twenty minutes. First countermeasure should be online by that point."
"Disable and restrain any personal displaying unregistered tattoos or bodily markings."
"Foxhound Squad, Space Marine Squad and Republican Squad report to Armory C147, C041 and C130 respectively and gear up. Rally at Foxhound Penthouse upon gearing up for distribution of specialized equipment. Travel in groups."
"All other active Gate Teams are to suit up and coordinate with active Security Teams to ensure noncombat personal remain uninjured and stationary. Problem is likely sourced in the Complex Gateway Wing. Likely Moderate or Greater Entity. Henceforth refereed to as Entity 004."