I was doing some random testing today and observed that Ward Ally has some weird scaling on the reverse execute bonus shield strength. In No-Cp Cyrodiil, my base shield value in the tooltip is 2561. So the max shield value that can be applied should be 5122. After damaging myself to 1% health the shield applied was 5091. So in order to get the max value the ward would have to be cast at <1% health... It's only a few points less than max, but it seems like hitting the max value would be more practical at like 5% health.
First-in-Line - Swings-for-Lethal
Green-Thumb - Scale-Factor
Hist-Tree-Major - A-Late-One
Needs-Some-Help - Dead-Last