Correct

一反常态

/ yī fǎncháng tài / 
Strokes

Definition

complete change from the normal state (idiom); quite uncharacteristic/entirely outside the norm/out of character

Example

Definition

depart from one's normal behaviour; act out of character; be contrary to one's usual practice

1
Tā
他
yīfǎnchángtài
一反常态
  
,
duì
对
wǒ
我
shēngqì
生气
dì
地
dàhǎn
大喊
  
。

He lost his usual equilibrium and yelled at me angrily.

2
Duìfāng
对方
yīfǎnchángtài
一反常态
  
,
tūrán
突然
tóngyì
同意
le
了
wǒfāng
我方
de
的
jiànyì
建议
  
。

The other side acted out of character and suddenly agreed to our proposal.