Swift as Shadows + Stealthy Sniper = No penalty?

[Renvale999]

I have a player who plans on taking both of these traits with his halfling(the Swift as Shadows is a racial thing, the Stealthy Sniper is a talent thing). Since both of these reduce the stealth penalty of sniping by -10, do they stack and reduce the penalty down to 0?

Any help would be appreciated.

[Mr.Alarm]

Technically yes, but as the GM you always have last say. If you think this will be a problem tell the player and forbid him to take that combination (but try to be nice about it).

[Eric Clingenpeel]

Yeah, like Mr. Alarm said they would stack. Stealthy Sniper makes the penalty -10 instead of -20 and Swift as Shadows reduces the penalty by 10. Of course this is at least a 10th lvl character and by then could have access to Improved Invisibility so I don't see that it would make that much of a problem.