When do you have to add "lah" and when you don't?. Would "Seranglah kakinya" work?
Why serangan kakinya is marked as incorrect?
'serang' is the base word, and it's a verb (to attack). 'serangan' is a noun (the attack).
[base word] + ['-an' suffix] = noun.
I'm worried about the guy with the foot.
Attack of the foot soldiers.