Focus Point Selector Fires Flash

[Gungnir]

This is probably painfully obvious to most of you but when I have the flash attached to the 30D and press the focus point selector button (*) the flash fires.

What function does it serve? Apart from temporarily blinding unsuspecting photographers.

 

[Gungnir]

Thanks Flash Exposure Lock.

Edit - Thanks also for not mentioning I got the buttons mixed up :O