Trident:

1.Hold use with a trident in main hand to charge the trident

2.Press f3 plus N to switch to spectator (the trident remains charged)

3.Release use button and the trident is thrown (riptide also works and launches the player in spectator mode)

*The trident used in spectator mode like this loses durability

*The same with bows and crossbows, but they only slow you down without shooting arrows or losing durability upon released