博士大拇脚趾受伤了，走路有点慢，机器人Custodian 嫌他拖慢了整个队伍
The Custodian considered. And then shot the Doctor in the foot.
He screamed and fell to the floor.
‘Now you are injured enough for us to carry you,’ announced the
Custodian smugly, and picked the Doctor up. A lift opened. ‘Efficiency
improved.’
大家能看懂机器人是怎么想的吗？