Pagoni throws the rock, and he throws it really well he thinks, hits the thing right on the bridge if it's nose as it spins and bucks. But with Capaneus on it's back, it doesn't seem to notice or care about him.
OOC:
So, in a situation like this where it's already engaged, you'd probably have to either actually cause damage to get it's attention, OR have narrative symbols to spend to make it happen.
I'll spend your two Threat to create Difficult terrain out to Short Range around the boar
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Sass, no check possible to try to Charm it. It's not an appropriate or applicable Skill for the situation, sorry. "Charming" or coaxing an animal would fall under Survival, as it is the animal handling skill.
You could re-roll a different Skill under the same narrative if you wanted? Survival would be an Average Difficulty with two Setbacks due to Cap dominating it's attention... PPBlkBlk, OR you could give a Boost to Cap trying to steer it?
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Eskaton, sounded like Cap wanted to try to "steer" it to a position further away from the wall, in line with the spike?
Since you're more trying to "break" it really, rather than ride it, you're looking at a Hard Survival check, upgraded once (RPP).
birdman and Sass, keep going with your RP if you want, push for your next Action, broadcast to the others what you're thinking, or visualizing as the next step, ask for direction from your allies if you don't know how to for into the scheme, etc.
As the monster bucks and spins, it's hooves tear great furrows and punch deep holes into the ground. It's romping has made it difficult for anyone who would try to approach it's rampage.