Yesterday I managed to spot my [elderly] cat just about to pounce under the hedge, to find a fledgeling blackbird on the ground. My cat is thankfully not a great hunter, and must have thought it was her lucky day!!
Thankfully today I saw Daddy blackbird regularly feeding it :D . Mummy blackbird was with the other baby in the nest about eye level. Any way my cat is now locked indoors for at least a week... :P
Well done for noticing your cat and the chick. I love this time of year with all the babies.....and like you I have cats, I have to do 'lock down' too. Much to feline disgust ;)