If you share “discreet” or “complete” languages in your reply instead of using pronouns as pointers, your message is shareable within its own boundaries of a message.
The same goes for people.
“I fucking love @nova”
and
“I agree she is great”
means that only the first message has the context for sharing.
This is very important while mastodon is young and our accessibility game is unknown. Sometimes a person might not have easy access to the original context.