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I think the negatives of short term fasting are over exaggerated, and 24 hours more than the typical 48-72 hours isn't going to drop you off a cliff. The 4th fasting day isn't going to suddenly atrophy 1kg off your biceps.
Slow muscle recovery maybe, and hunger pains, but literature suggests reduced inflammation, blood sugar control, and improved immune system.
Most people have plenty of fat reserves to go without food for weeks and weeks, but definitely not ideal for being functional or preserving muscle mass.
A hard interval sessions sounds brutal on a fast though.
Bottom line is, not eating is the quickest way to lose weight. Any food eaten will slow you down compared to not eating. Losing weight while not turning into a broken shell resembling a human being is a different formula.
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Acliff
Doing a 4 day fast seems daft enough... But adding in a hard interval session too?! Just seems like a recipe for muscle damage, slow recovery and maybe illness and injury.