Tok so much kok but neber do action....
if you saw what happened, and sure the old man did it
intentionally, causing uneasiness in the girl by way of her facial
expression, then you shld go up and do something.
But then again, if the girl didnt realize that she was offended,
there's no need to do action causing embarressment. Instead nca go
and do subtle action against the old man, e'g, step on his
feet,
or raise your elbow to against his face...etc...
See something bad happen to somebody but neber do anything, pwweet!
Typical S'porean....