静如疯狗动若脱兔
[jìng rú fēng gŏu dòng ruò tuō tù]
'Jing Ru Feng Gou Dong Ruo Tuo Tu' is a funny exaggeration. Literally, it means 'Silent like a mad dog and moving like an escaped rabbit'. This phrase expresses that this individual can be very quiet at one moment and incredibly active and quick in action when needed.