I was Sec Officer Isaac Mueller that round. I'll go from the start. So the moment I come back from being AFK(I was doing some 'paperwork' for the first 10 or 15 mins of the round), another officer says we've got four armed intruders breaking into the bridge (which literally nobody on the entire station had access to because there was no command present, not even a HoP.) Me and another officer rush towards the HoPs office, and see the four mercs in full hardsuits, armed to the teeth. They open the doors with the captains ID which they stole, tell us nothing besides stay out of their way, and then enter the maintenance tunnels. Since we had no idea what to do besides keep crew safe, we decided its best we sit back.
A few minutes pass, we're telling everyone to sit tight and co-operate. These guys still haven't stated any demands and so Carmichael (The OP) asks them to state their demands. They give a very poor response along the lines of "We're just here to steal." None of sec was really sure if we should engage them or not. I believed they were dangerous and could have been masking other intentions so I tell the Warden to prep our guys and dispense guns. At this point I unfortunately contracted appendicitis and had to quickly check out what it was at the Medbay. They couldn't cure me because the mercs had stolen all the surgical equipment so I told them to give me painkillers and made my way back to the brig. I realise, as I walk through the front door of sec, four guys in red inside of the hallway above the waiting area, under the armoury. One of them yells at me to put my weapon down and surrender while the other one(Unfortunately I have forgotten who) decides to bum-rush me through the door without even giving me a second to respond. I open fire since the guy immediately opens the door so technically I fired first but I believe I was more than justified as I was literally a tile away from the door. Then began the first firefight of the round and my last since I got my legs shot off and then got hacked to death by someone with a sword.
I was then cloned by medbay but I couldn't return to action because of genetic defects so I spent the rest of my round in Medbay.
Overall, the conduct of the Merc team that round can only be described as poor, with no exceptions.