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I'll call out of my area, but before I do, I consider a few points...
1) Where is my partner?
2? Does my partner have a view of the play or where they screened?
3) What is the potential call?
I'll never call a foul or traveling on a 1 on 1 matchup that is right in front of them with clear line of sight.
As lead, in a half court situation, I don't think there are many situations that warrant calling in the trail's primary....unless they are simply asleep at the wheel. One exception is when A1 is toeing the sideline on the lead's side and above the FT line extended. B1 comes up behind and gives A1 a little bump, knocking them OOB. Trail is going to be in the middle of the floor but still doesn't have a great view. Lead is covering lead's sideline and has a perfect view between the bodies. Trail's primary but lead can make the call.
As trail, in a half court situation, I think there are a lot of opportunities for the trail to help out.
For example, ball in the paint with lot of players. A1 on lead's side spins across the key and is fouled by a secondary defender from the top side during the spin. It's a common situation but it is often that the lead can not see this.
Another example, lead covering ball deep in the corner with A1 being guarded by B1. A2 is setting a screen nearby with B2 also nearby. (Lead is well occupied) Trail, who has shifted positions to be well into the floor looking down the lane, is covering off ball has post action...even on lead's side. Quick drop pass to A4 on the stongside block with B4 covering. B4 shoves A4 in the back. The lead, if in the right position to cover the corner will likely not be able to see this or be able to get into a new position to see it in time. The moment the ball is there, this is technically the lead's primary. However, the trail has seen the whole play. Lead can call it but I'd expect the trail to take it.
Anytime the ball is in the paint (or any confined area) with 7+ bodies, off ball and on ball are nearly the same location. The trail should not be afraid to cover action on the closer part of the paint. Sure, it may be lead's "primary" but the lead may end up wiht 6 bodies between him and the action.
The book definitions of primary and secondary are only guidelines. If the players are imbalanced or packed in tight, the areas should shift so that the play is well covered.
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