Tā xiànzài chéng le luòshuǐgǒu, méi rén yuànyì bāng tā.
He's become a fallen figure now; nobody is willing to help him.
Tips
culture
The famous phrase 痛打落水狗 ('beat the drowning dog') comes from Lu Xun, meaning to show no mercy to a defeated enemy. It was widely used during political campaigns in 20th century China.