Explosive Manoeuvres adds explosive fireworks. Simply craft a "big ball" firework using the firework star crafted with a fire charge, and you'll make a firework that can deal damage to the world! As well as dealing increased entity damage, it deals an extremely large amount of knockback, effectively letting you rocket jump! Normal crossbows focus most of this horizontally, whereas multishot crossbows add a lot of vertical knockback too (and increase horizontal). Multishot crossbows focus all of the explosivity in one of the fireworks and are also quite volatile, sometimes one or two of the fireworks explode prematurely when shooting.
This means it can be used both as a weapon, and also as a movement method

It's fully survival friendly, and really fun to use - just don't forget your blast resistance!