How to say "他应该是在一旁暗中观察" (tā yīng gāi shì zài yī páng àn zhōng guān chá) in Chinese dialogue

yīnggāishìzàipángànzhōngguānchá

They must have observed from the side,

Idioms & Colloquial Expressions
Grammar Patterns
INTERACTIVE SCRIPT TIMELINE
LINE 0113:04
dàn
què
shí
fēn
shú
sān
shī
xiōng
de
gōng

but they are very familiar with Yuzhi.

LINE 0213:07
PLAYING SCENE
yīng
gāi
shì
zài
páng
àn
zhōng
guān
chá

They must have observed from the side,

LINE 0313:10
rán
hòu
pàn
chū
le

predicted

Show Information
Source MediaTV Series
Season & EpisodeS1 E31
Timestamp13:07
TMDB ID262932