One of the classic tropes of a cinematic monster fight is the hero leaping onto or clambering up the monster to get at its head, throat, heart, etc. It’s often the only way to damage a very large monster with melee weapons.
In a Vivid game, this ‘flea-hopping’ tactic is resolved like a Chase. You must win a stated number of Victory Points, based on the monster’s size, to reach a vulnerable spot.
This could be 1 VP for something like fully grown saltwater crocodile, to 3 for a big Raksasa giant, to 4 or 5 if you take on something really big like the Mameleu sea dragon.
If you reach the required number of Victory Points, your subsequent Victories wound the monster normally.
If the monster wins a Victory at any time you were ‘flea-hopping’ onto it, or while you’re attacking it while perched on the monster, you are dislodged in addition to taking injury unless you can pay the Save Cost.