Wariness and Frenzy cancel stealth events, specifically.
You mean
Relentless, not
Frenzy. There's also
Seeking it Always to cancels stealths, which has the huge advantage of working from the support area (and the disadvantage of having to exert a
tracker, which were all 2-vitality weaklings until Set 5).
Free Peoples player plays Strength of Kings (cancels Wariness)
Strength of Kings can only cancel Skirmish events, so can't cancel a response event like
Wariness. Besides, it can only work on a
Man's skirmish, so cannot be played in a moment where another resource would "cancel a skirmish involving a Hobbit." Still,
Swiftly and Softly can be played in Isildur's skirmish for no effect if that's your intention.
Now, you can change
Swiftly and Softly to
Hobbit Intuition, and
Merry From O'er the Brandywine to
Friend to Sam. Then the stealth would work as a pump, and the hobbit might be trying to save Isildur from being overwhelmed or critically defeated in
his skirmish. Then
Wariness can be played vs the Intuition in Isildur's skirmish, but
Strength of Spirit still cannot counter
Wariness.
Keeping the "cancel a Hobbit's skirmish" idea, we can think about
Tom Bombadil /
Filibert Bolger cancelling Merry's skirmish, and
Haunting Her Steps cancelling the ally's skill. Then,
The Board is Set /
Wise Guide can cancel Grima's event.
Instead of
Haunting Her Steps (an event), might be a special ability like
Warg et al. Then,
Storied Homestead or
New Authority can cancel the
Warg's skill.