To bad see that something like that happens, and Erasmo is my friend, he is a very good person..
I never try to make trade that involve 2 transactions because of that..
Another trick the scammers use is that they sell a very good item, then At trade they show you the item, cancel and trade again but they put a lower quality item that have same image as the good item.
So people be careful with trading, always check what are you receiving, and never trust anyone who ask u ur id and pass to give free mcoins..