The instant Oliver heard the door, he reversed his progress by a few steps, more to put himself closer to Edwin than out of any fear of Simms. He shot Chase one final look, judging the distance to see if he could at least drag the kid into the cell with him to get him out of all that tape, but he halted too long, not wanting to put Edwin at any further risk.
When Simms approached, Oliver cast one long look at the hose, then took one more step deliberate step backwards, his good hand braced against the bed frame, his attention moving back towards Simms. After a heartbeat, he moved the hand, reaching it through the bars, palm up.
"Key." One word had probably never relayed so much focused, barely-controlled murderous intent, but it was far more important to him that Edwin's cuffs were removed so he could try to do something about that arm.