QUOTE (Stahlseele @ Jun 28 2014, 09:06 PM)

Magic in the Shadows is the SR3 Magic Source Book O.o
You've seen the SR3 tag on the thread, no?

QUOTE
And why would you learn metamagic like that?
Do you pay less karma for it like this then?
Else, why not learn it by the initiation you need anyway?
Like what?
For 15 Karma in SR4?
If yes, it is in addition to metamagic techniques you can learn.
Technically, you initiate, then gain a metamagic technique of your choice without the need for a mentor or somesuch.
Street Magic later expanded upon this and introduced the optional way of acquiring metamagic techniques by getting taught or by metaplanar quest or whatever.
This way is in addition to the technique learned upon initiation, and costs 15 points of karma, as well as the cost for the teacher (be it in money, or e.g. services rendered
, or possibly more karma in case of a free spirit [edit: strike that, the 15 karma go to the spirit in full]).
For example:
Wynona Witch initiates to grade 1 and chooses to acquire Masking. For this no test or further investment in ressources is required. She just pays her 13 Karma and can now enjoy a raised maximum of her magic attribute, has access to the metaplanes and gains the power to mask her aura.
A short while later she meets someone who tells her of an advanced technique for also masking her focuses, and she gets cracking. She's not the studious type for research, doesn't know any free spirits (or trusts them), and deems a metaplanar quest as too dangerous, so she just tries to find a tutor, at which she succeeds.
She pays him in money and the promise for a future favor, and he rolls his Instruction dice pool, adding a few dice to WW's learning test. After about a week of intense training, she pays 15 karma and now knows Extended Masking, without the need for a second initiation.
At this point in her career, an initiation would have cost 16 points of karma, while also providing all other benefits of initiation (at this point only the increase in max Magic) but this is only an example.
If WW were an initiate of a higher grade, the gap widens.
Personally, I also limit the amount of additional techniques to one per initiation grade, instead of the book's rule of Magic+Initiation Grade