Recommendations:
Canterbury Hockey strongly recommends that all teams use protective facemasks for those players 'protecting the post' during Penalty Corners.
YouTube links:
Bernie Pangrazio, Australia and Oceania Umpire and Umpire Manager. has produced a great series of education videos. Some are provided here, but more can be found by searching RULES GURU on YouTube
Below is a helpful video to assist with when is the right time to remove the face mask after the defending of a PC.
When is the ball out of play?
When is it a Penalty Corner?
5m and hits outside the circle...
https://www.youtube.com/watch?v=nm08bW8XkR0&t=3s