Confused about iphone dots texting icon?

Ok, so this may seem like a random question but it is bugging me out a bit. So when a person is texting with an iphone and i have witnessed this from personal experience, if there's a message being typed and the letters are backspaced but there's a word left, the little dots on the bottom that show someone was typing will still appear on the recipients phone. This is fact as I have seen it happen. But another thing that happens is that whenever I will be texting someone and I backspace letters the other person will start typing thinking that I'm no longer typing which would suggest the little dot icon went away on their phone. Thoughts?

The dot icons appear whenever someone is typing on the other end.

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