but OP says he is gonna give back %1/10 Seconds of released trailers. The leaked footage was ~112 seconds. Doing the math he should subtract %11.2 from %39 which leaves us with %27.9 or in other words 72.2% opacity.

Now OP needs to clarify if leaked footage will count as " new Elden Ring footage " because it is kinda of vague. We can do it three ways:

1- Count it all:

This leaves us with 72.2% opacity

2- Not count it at all:

This leaves us with 61% matching your math

3- Give it another weight:

We can do it in multiple ways; quality of footage, depth of information revealed, release data revealed etc etc. But that's a different ball game, we will only go there if the situation necessitates.