Replying to
@paulg@mas.to
@paulg I plan to write a post about this... when Twitter users organically did "quote tweeting" before 2014, they used to write a reply to someone and move the '@' sign later in the text.
Like "I agree @ person: I love ice cream"
Since the @ was not at the start, such replies used to be visible to the replier's followers too
When Twitter implemented native QT they broke this concept. QTs were separate from replies which was their 'original sin' I think.