That dude was definitely going too hard if that was your first time sparring.. with that said, if I were you, i'd rear back and throw a straight right to his nose, it's open ALL DAY.. You may take a punch or two but he will back up if you hit him without a doubt. For the record i, personally, wouldn't do that in a sparring session but this guy is clearly trying to overwhelm you, someone who is a beginner.