Just SLF, but the last safety briefing I heard said:
'Pull the mask over your mouth and nose and breath normally. Please note the bag does not inflate.'
Seems pretty clear to me. I think this is from a plane with cylinders, not chemical oxygen generators. How hard do you have to pull the lead for a chemical oxgen generator to work?
I am no fan of Ryanair, but if this had happened to BA it would not be news.