re 'contrary to basic flying rules, perhaps this overlooks the influence of surprise and reversion to 'most recently' refreshed training.
If First Officers experiences' were limited to observing the Captain handling UAS procedure, and that was the most recent but irrelevantly trained immediate action, then we should not be surprised when startled pilots attempt to copy that procedure. Otherwise we need to revisit our assumptions about human performance.
Compare this with Colgan. Recently training for irrelevant tail stall, 'stall' warning given, surprise, procedures for tail stall executed simultaneously by both crew.
Lessons learnt; identify and revisit assumptions, consider what is taught and the context of instruction.