Pump and dump is illegal, as well as sending emails via botnet. Don't expect Toyo to come in here and give all the details of this situation ... it just creates a trail back to him which can be used against him for jail time.
Neither party deserves sympathy, if all speculation is correct it is paramount to the OP robbing a bank and being pissed off when he found out his get-away driver (Toyo) split.
The question is whether the deal was arranged through BHW without a sales thread or whether Toyo promoted his services using his identity at BHW as a reference.
Beyond that ... what does it boil down to? The OP is assumed an expert in mailing for pump and dump and apparently it was Toyo's first attempt at it. The OP could have very well known that it would fry Toyo's bot net and withheld that information ... knowingly causing Toyo to lose an asset. It sounds to me like Toyo lost something far more valuable than 4k ... should he bear all risk and fully accept the losses under those circumstances?
I don't have sympathy for either of them ... but the OP was engaging in risky business and Toyo CANNOT defend himself here without jeopardizing his freedom, and if that business didn't originate from here then why should he have to defend himself here anyways?
+1 to not banning if it was arranged outside of BHW, +1 to banning if it was.