Haha, everytime you type something I look at your avatar and then; I read everything you type with the sounds of a bear
A botnet is like a room full of computers, if you pay to get acess to a botnet, you get acess to very many computers, and with those computers you can ping the hell out of somone(ddos) you send very large packages from these computers at the same time to an IP(you can get somones ip through skype) so that's why he is afraid =P.