Maybe you might want to read this @CHRISTINE BOLES and even apologize to her:Please don't rescue anymore chicks, you don't know what you are doing. Chicks don't get toys, because they eat dam near anything ,second why would you put a chick on a bed? Do you not know they are fast by nature and now because of your recklessness he will more than likely die just like the other chick. I can't believe you did those things they are not a cat or dog. Find a farm and give them that chick at least he will have a better chance of survival..
Saainya, get some photos, you mention his legs are swollen. It may be that there's nothing you can do and he may not recover, but I would like to see. A sling is probably a good idea to help take some weight off the legs for the time being until you can make further decisions.
As for making assumptions about an OP, we all have done that. Talking about them like they don't exist is in bad taste. It wouldn't take but a couple of minutes to look at someone's profile or BYC posting history to determine how much experience or proper care a person gives.
Saainya is one of the most caring and passionate people I have met here on BYC.
No one is perfect. Accidents happen. While recovery doesn't sound promising from the description of injury, giving the OP support and constructive suggestions is a better course of action instead of tearing them down further when they are in distress.
I second that @Saaniya is a very caring and responsible person. She has a lot of knowledge about chickens and loves her pet roosters. She helps people here on the emergency forum often.
I hope that you can get your rescue cockerel to survive Saaniya. If you could use a mushy chicken feed or mixture that you give your roosters, that might be best. He might have swallowed something similar that the other chickswallowed.