people, outside, throwing stuff over the top of them.
The young kids were throwing garbage on the homeless man.
The word people does not indicate age, it cannot be assumed that they are young kids.  It cannot be inferred by their throwing stuff that they were throwing garbage, there are many other things that the word 'stuff' could refer to.  Because children throw stuff over them does not imply that they are throwing stuff on the homeless man; the presence of a homeless man cannot be assumed, nor is the concept that garbage is being thrown on him implied at all.
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