La Vuelta.

[jomifl]

Why should team sky and katusha be expected to let other riders involved in a crash of their own making catch up?

[sandyRoe]

Sportsmanship?

[jomifl]

Why should the race leader get special treatment. Usually rider who crash only get helped by their own team members if at all.

[boxtops]

Team cycling seems to have group rules of its own, about letting each other win.

[Mattk]

Its racing etiquette.
Similar happened in le Tour with Cadel Evans when he had a puncture from the carpet tacks incident. Wiggins as the leader slowed the peloton to allow him to catch up.