Jabber/Bjorn vs cumulative defence up/down

So the lingering question feeding my insomnia tonight is about heroes that do simultaneous hits where a hero has either cumulative defence up or down.

Best way to describe what I mean might be if have Krampus special active and he gets the 2 hits from jabber - does the first hit cause his defence to increase prior to the second therefore meaning less damage? Or are they both simultaneous at same defence points?

Example for the bjorn one would be if facing one enemy and have already fired costume Brienne, when bjorn does the second strike is it against a weakened defence stat?

Dont have Krampus/ Jabber to test. Do have the other two I could try best rare event, but thought someone might know this already…