Hi Myles,
you are correct with your guess.
e.g.
bundle 1, operator is OR x4, given 1st was match, fusion ignores remaining ones. It's pure logic, for OR operator if 1 is true, entire condition is true.
bundle 4, given fail on each of first 3 steps fusion had to check up until step 4 to verify condition is met.
Cheers
Rafal