Explain this donk move to me

[Ghazban]

Some sort of multiway raised pot, assume pot is 15BB or something. The flop comes with two cards of the same suit and donk A, who was not the preflop raiser, minbets it (you, know, because he's sneaky and wants to draw at his flush cheaply), somebody calls, and donk B raises this 1BB bet to ...... 3BB [img]/images/graemlins/ooo.gif[/img] Wow! What a monstrously powerful raise that is! I imagine there's a ton of folding equity there!

Tell me why people do this.


Thanks in advance.