Blocking attacks against another character.

[Neroange]

Originally Posted by sir_pudding

If somebody uses up a combat perk slot in order to get a perk, and then it turns out that there's a house rule that effectively gives anyone that perk for free then he's probably going to be annoyed that the GM didn't tell him that in advance, or at least when he saw it on the character's sheet.

By RAW, no.

can you site your source book and page please.
This sound like a breakdown in the rule system going from 3e to 4e. One of the unique aspects of GURPS is it use of defaults, except for double defaults and extremely complex and SUBTLE skills/actions, if you can think of it you can try it.