I remember when Ron Arest(AKA Metta World Peace) hit a player with his elbow while celebrating a play, the media called it a dirty play and he was suspended and trashed in the media..I did NOT consider that a dirty play that was an accident, but this, I saw it last night and it looked pretty intentional to me..good thing Im an Angels fan :-)
Sliding to break up a double play is an intentional and legal play.