PSA
Just spent more time than I should have on figuring out how to get a 420 combo on this map. For a 420 combo A, miss 00:13:559 (3) and FC from 00:13:934 (4) onwards.
A 420 combo S is significantly harder, as there are no regular sliders long enough for you to sliderbreak on in this map. You'll need to use the reverse sliders. The easiest way here is to sliderbreak at 00:14:559 (3), then from 00:15:059 (1) onwards, you'll need to miss 7 sliderends. For ease of memory, it's probably choose the last 7 sliders in the map, which are conveniently slow. The first of these sliders is 01:26:059 (1).
EDIT: I miscalculated. It is not possible to 420 combo S via sliderbreaking.The only way is to miss 76 sliderends. I believe this is a massive oversight on the part of the QAT. 0/10 map.
Missing 76 sliderends: Turn on NoFail or Easy, miss all sliderends up to and including 00:33:309 (6), being careful not to sliderbreak at the reversing sliders, then FC the rest of the map. You might be able to do it without NoFail, but you'll have to spread out your missed sliderends across the map to avoid dying.