The task would be full tasks. Exp would be less (due to reduced from toger pkayers kills) and the points would be reduced more than likely.
Hence why there are better implinentations for slayer, such as halfing task quantities, for full rewards.
*If duo slayer was added also note it would not for for boss task, wilderness slayer or Boss Slayer.
*It would only be able to be used on GIM and Normal free trade accounts