While I think everyone here knows what that term means, I think the write-up and videos demonstrate the major issue with Flowers. In both of the demonstrated cases the defender gets into the offensive lineman's chest allowing him to control and overpower them. In both cases, had the offensive linemen protected his chest and had punched first they wouldn't have been "put on skates".
http://insidethepylon.com/football-101/glossary-football-101/2015/12/23/itp-glossary-put-on-skates/ (http://insidethepylon.com/football-101/glossary-football-101/2015/12/23/itp-glossary-put-on-skates/)