OK... Maybe you're not missing anything, and I am. It's all about interpreting the information we were given on the tv and we really weren't given much to go on!
It's just - what we saw in LotTL was obviously the first time they'd managed to get the screwdriver, otherwise the Doctor would have known only the Master could use it. And honestly, it can't have been that hard to get it off him, so I assume that was the first time they'd tried.
And if they hadn't tried before to get the screwdriver, what on earth did they try? How could they possibly have got anywhere without disarming the Master?
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It's just - what we saw in LotTL was obviously the first time they'd managed to get the screwdriver, otherwise the Doctor would have known only the Master could use it. And honestly, it can't have been that hard to get it off him, so I assume that was the first time they'd tried.
And if they hadn't tried before to get the screwdriver, what on earth did they try? How could they possibly have got anywhere without disarming the Master?