hello, thanks for your kind comment ^^.
I am not entirely sure about the scenario you described, but in your screenshot, it is possible to get rid of 2 pirates by selecting them after pressing the beast button.
When there are more than two pirates available and you press the beast button, you select one pirate (which is highlighted) and then a second pirate, and they're discarded.
If you don't want that pirate you can click on it again to un select it, or cancel the pirate selection all together by pressing the beast button again.
Hope it helps.