I sure hope the 2nd shot is taken before the target starts to drop. A legal Bunker target flies 76 meters +/- 1 meter so around 83-85 yards before they hit ground. The target will be at its zenith around 40 yards of flight. The shooter stands 15 meters behind the bunker so the target will be somewhere around 55-57 yards from the shooter before it is halfway through it's flight. That is a LONG way to take a 2nd shot let alone allowing the target to commence dropping and be even further away.
For a good discussion on bunker including POI look at the link above. Derek did a nice job on this.
I bought Derek's older bunker barrel.and it was almost a whole pattern at 20 yards different from top to bottom with .028/.038 chokes.. It was fantastic once I got use to shooting right at the falling target..as the bottom shot low.. I reworked the barrel to shoot 3" high and 1" low at 13 yards.. I have done well with it..but for the most part do the same with a 50/50 barrel set up to shoot 2" high at 13 yards.. There is much to be said for shooting ONLY 1 gun.. I suggest to anyone.. play with them all.. but when you want to win something..shoot 1 and lock up the rest.. And for those who shoot 1 gun..LOCK you adjustments down.. Period..once they are set correctly..
I got to thinking about PerazziBigBore's comment about grass cutters. They -- the 1.5 m targets -- shouldn't be. Unless the targets are mis-set; a not-unusual occurrence.
A rough test is if the targets reach at least the height of your eyes. If not, then it's protest time.
The 1.5 m target rises to about 6.5m at a point about 45 meters out (Interestingly, the ATA target is on the ground well before this target has reached its apex.) so if it's set legally, it never "cuts grass".
Since this is the lowest (but still rising) target, I suspect a dead-on POI may well not be the best way to go. I've long noted that I often shoot the bottom off a dead straight-away 1.5m target. I smoke a good percentage, but I virtually never see a shoot-over-the-top target break. Could be bad habits, could be a low POI that doesn't help... My Perazzi shoots about 4" high; my next one will definitely be set to shoot higher.
By the way, if you look at the 9 schemes, targets set 2 m or less make up about half of the program. Scheme 9 (easiest?)has the least, 2 (hardest?) has the most.
Gamebirds shot from an elevated shooting position also requires a tad higher impacting pattern. Or at least does for me. I'd think that "grass cutter" target would be nearly the same? Never shot bunker though but grouse is doin about 60 mph for some shots. I've shot quite a lot of those. Hap