Close Call Sports has a feature up on the Matt Holliday play at 1B in Saturday's game.
The TL;DR version: according to CCS, retired runner Holliday has the same right to do a bona fide slide to break up a play at 1B as any retired runner has to do a bona fide slide to break up a double-play attempt at 2B.
Whether you judge the CCS take as compelling or not, I still think that Moreland's avoiding contact with Holliday rather than making an attempt to field the throw reduced the chances of getting the interference call.
CCS also has a story on the most recent successful MLB protest.
The TL;DR version: according to CCS, retired runner Holliday has the same right to do a bona fide slide to break up a play at 1B as any retired runner has to do a bona fide slide to break up a double-play attempt at 2B.
Whether you judge the CCS take as compelling or not, I still think that Moreland's avoiding contact with Holliday rather than making an attempt to field the throw reduced the chances of getting the interference call.
CCS also has a story on the most recent successful MLB protest.