I think that this sentence needs 'and' after the word 'room'. Am I wrong? See this picture below. I think that 'pounced'is the past form of the verb 'pounce' in this sentence. Could you Please tell me why there is no 'and' in this sentence. And can I use 'comma' here instead of 'and'?
No, there should be an "and" in the sentence because it is a compound action - the cat did A and then the cat did B. You could omit the comma if you were making a list of actions, at least until before the last action. Examples of these kind of lists:
The cat ran into the room, pounced on the son, and ran out.
We drove to the campsite, set up the tent, and lit a fire.
Here there are only two connected actions so they should be joined in some way, as in these examples:
The cat caught the bird in mid-flight and brought it inside to show off to her owners.
The cat knocked the glass off of the shelf, and then, for no reason, knocked another off.
The cat sharpened her claws on the new sofa and then threw up on the new rug.
(Side note: As a cat owner, I don't believe this story about the cat saving her owner. My examples are much more plausible.)