How to pronounce 火勢 in Cantonese (4 out of 5):

等啲火勢自己慢慢燒盡
Let the fire burn itself out.

Cantonese Sentence Breakdown

ting2
sort
kind
type
dit1
only a little bit
火勢 fo2 sai3
fire intensity
自己 zi6 gei3
myself
慢慢 maan6 maan2
(verb) Take someone's time
siu1
to burn
to cook
to stew
to bake
to roast
to heat
to boil (tea, water etc)
fever
to run a temperature
(coll.) to let things go to one's head
zeon6
to use up
to exhaust
to end
to finish
to the utmost
exhausted
finished
to the limit (of sth)
all
to devote all to
entirely
to come to an end