Doctor Who: 10 Problems With Revolution Of The Daleks
8. Impossible Prisoners
The Judoon aren't seen to be the most competent of police forces at the best of times, which begs the question - how did they manage to capture and contain a Weeping Angel?
Even more problematically, Weeping Angels have the added defence of escaping through images, with images of them even becoming Angels themselves. The space-jail, and the cell-block, is shown to be watched by security cameras - a memorable scene at the beginning of the episode has the Doctor greeting them. However, any camera capturing the Angel would potentially release a new Angel as well. The Angels would, therefore, be able to overrun the facility fairly easily.
The only other Angels captured in Doctor Who allowed themselves to be so for a reason, such as in 2010's The Time of Angels. The Doctor's familiarity with 'Angela' suggests that it had been imprisoned there for some time, and presumably without a plan of escape - something which is very out of character for the mysterious species.
Likewise, we saw in the Thirteenth Doctor's first series that the Pting could eat through any inorganic materials, so why was it having problems in the cell? Its debut appearance, The Tsuranga Conundrum, went to great lengths to convince us that it couldn't be captured. Imprisoning a Silent would also be difficult as its jailers would instantly forget its presence when they turned their backs. This was seen famously in 2011's Day of the Moon, when Area 51's doctor continually forgot the Silent he was treating.
The inclusion of these particular monsters in the space-jail may have proved that the jail was deadly, but not entirely plausible when looking at established lore.