Watch as Coach explains the first read on pick is to accept or reject it. The second read is to stick or slip the pick. The player must listen, look, and feel the defender to get an idea on how they are playing it. If it is a switch, then you should slip and if the defender stays you should stick the pick. A good way to remember this is they switch we slip; they stay we stick.
This clip comes from a full-length session featured in a past IMLCA (Intercollegiate Mens Lacrosse Coaches Association) Coaches Clinic or Convention. Access to this full session, along with 150+ full-length IMLCA sessions -- can be found on the IMLCA Video Library.