@Walori:
you are false, if the compiler expect a vector and you only whrite my.x,the compiler takes my.y,my.z automatically for the vector!!!
(the same if you use my.pan (tilt,roll), my.blue (green,red)...)
so effect_local(p_blood, 200, me.x, normal); is right !!!

@darkmaster:
you are sure that the me-pointer is pointing to the tiger?
If yes, post your particlefunction for more help...