R.I.P. Skullbasha - Squig Cowboy Event

In our first session, we drew the Challenge Event Card, and Skullbasha was defeated by the Barbarian in a tense single combat.  I want to preserve a sense of verisimilitude in the campaign, and it would do no good to keep having Skullbasha turn up every now and then whenever his Event Card is drawn!  I intend to preserve the uniqueness of all named Monsters in the game in a similar manner.  When the Challenge Event Card comes up in the future, I plan to use the following Event:

Squig Cowboy

You hear the unmistakable grunting and acrid smell of a Cave Squig.  Sure enough, soon 3 of the beasts are before you, along with six Goblin Squig Herders that are off their gourds on Madcap or some other even more potent narcotic.  The Goblins sneer at you, scoffing that you surface dwellers don't have the guts to tame and ride a Squig.

One of the Warriors can volunteer to prove these Greenskins wrong (some Warriors simply cannot refuse a challenge!)  If there are no takers, the Squigs and Herders attack in a Frenzy (2x normal Attacks).

If a Warrior accepts, the Herders sweeten the deal by offering some wagers.  Each Herder wagers 1D6x50 Gold, and a single Warrior can take on each wager (go in Initiative order).

Each turn, during the Monster Phase, the mounted Squig bounces 4 squares in a random direction.  The Warrior must use their Strength and Initiative to stay mounted.  Each turn, average their Strength and Initiative (rounding down) to get their total "Rider Points".  Each turn, the Warrior takes 1D6 unmodified Wounds from being viciously whipped around and smashing into the walls and ceilings, but can use their Rider Points to reduce this damage.  Next, the Warrior must pass an Initiative Check to remain mounted.  They can apply the remaining Rider Points to this roll, even turning a roll of 1 into a successful result if enough Points are applied.  If the Warrior fails the Check, they are flung off the Squig, taking an additional 1D6 unmodified Wounds.  The Warrior wins the challenge if they can remain mounted for 4 consecutive turns (during these turns no other Unexpected Events occur).  If the other Warriors in any way intervene in the event, the Goblins and Squigs attack.  After the spectacle, the Goblins depart, either alot richer, or quite a bit poorer than before.