They are.
One is the cost of casting the spell (300)
One is an effect from the spell (-750 drain)
Basically, the spell does two things for everyone in your group. Evacuate them to entrance, and as a penalty, drain their mana.
Torpor had a similar mana drain per tick in early Kunark (-50/tick). Unfortunately P99 never got to enjoy that extremely classic version of Torpor. The spell is way more balanced when it drains 200 mana on whoever it's casted on.
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