I have a new and more consistent method of doing Crab Kill here, so if the old method is inconsistent for you, try out this new method!

It's the same exact thing as before, except you throw your first hat way later. I find that this avoids the "fake hit" (where you hit the glasses, but it doesn't count as a hit), while also being easier.

You might still find the older method good as well, so if it works better for you, here it is:

It also goes a bit more in-depth about how it works while also having slowed-down footage, so you might find it a bit more easier to understand.

For Crab Kill, I highly suggest losing the powerup to one of the birds at the end of a level, since doing it with the powerup is way harder (and losing it doesn't lose that much time) Also, make sure to stand on the edge of the train when doing this.

Beard also has an alternative way of doing this bossfight -

Example (Timestamped):

If I can find a consistent method with the powerup, I will update this guide. In the meantime, hope this helps!