You can manifest a power simultaneously with another power just like it.
Manifesting a power altered by this feat
causes the power to take effect twice on the target, as if you were simultaneously manifesting the same power two times on the same location or target. Any variables in the power (such as targets, shaping an area, and so on) apply to both of the resulting powers. The target suffers all the effects of both powers individually and receives a saving throw
for each. In some cases, failure of both of the target's saving throws
results in redundant effects, such as a twinned charm person
, although any ally of the target would have to succeed at two negate attempts in order to free the target from the charm. A twinned power costs a number of power points equal to its standard cost +8.