Sharing with mac, mac taking 99% of internet power?

[Scorcht]

A few things to notice before reading:
On vacation
Wifi is completely fine without mac using it
No ethernet cables neither or plugs
I have a elitebook workstation 8760w (pretty good specs)
A mac book pro is beating me up using all the internet

So, I have this amazing windows computer that has really great specs, and then the macbook does something that uses wifi, then all hell is broken loose on my ping. My download speed goes to a kb/s, same with upload. Everything that uses wifi freezes. Its all fine when the macbook is turned off, and my friend goes to do something else. I get 70ms to all the servers that I like to connect to.

I don't know what to do. I'd honestly just try to beat up my friend and force him to stop using his dam computer, but I'd rather not. I want better internet desperately, please help me ;c

 

[Shimshom]

Does your friend happens to have a BitTorrent client installed and if so usually one can limit the bandwidth such a client uses as from memory they tend to be set to use 100% of available bandwidth by default

 

[Scorcht]

Does your friend happens to have a BitTorrent client installed and if so usually one can limit the bandwidth such a client uses as from memory they tend to be set to use 100% of available bandwidth by default

Nope ;c. It seems that every time he issues a command (such as a click) I get a major spike in ping to websites and such