[JRutledge]

Mechanics are mostly suggestions anyway. There is not a mechanic to cover every situation and certainly, not all situations can be gone over in detail. I do know this, there is no way a Trail can see a player step on the line with clarity as the lead can who is looking up the line. So even if the mechanic says to have the Trail take these calls, there are situations where that would be nearly impossible other than an errant thrown pass. Otherwise, some plays might be bang, bang and the Trail would be guessing. So the mechanic might not be stated to cover all situations, but if you have been doing this long enough, you probably need to discuss some variations of the coverage, just like you do in other aspects of the mechanics. The PCA is often discussed, but very little about secondary coverage and when certain calls need to be given to the person not covering the primary.

Peace