What happens when you don’t shoot the onion in Cuphead?

What happens when you don’t shoot the onion in Cuphead? If you don’t shoot him, he won’t cry, then, he will leave and when Psycarrot appears Radish will be with him.

If you don’t shoot him, he won’t cry, then, he will leave and when Psycarrot appears Radish will be with him.
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