I think he said the counter hit every time 42 at least after yugito nii chase applied and yugito hits 4 targets, if there's no dead enemy even if some of them avoided the 40+ requirement was reached, so the 30 chase should be triggered regardless, no? Otherwise the number 40 shouldn't appear.

I mean, lets say he fought minato, masked man + other two and that yugito hitted twice with the lowest combo, 6, so he hit 12 and azure fang triggered. If he didn't hit neither minato or masked man the counter reached 22 and then yugito chase procced, but even if was avoided twice, for two times would still have hit, so the 32 was reached. If instead main chase was avoided also yugito chase wouldn't have triggered. At the point yugito triggers is hard for roshi to not follow too.