First, if the limb is twisted much it may come unstrung faster than you say, ouch. First inspect the bow for factures, cracks etc., then in good light, set one limb (unstrung) with back up on a table, hold the other limb and sight down the limb, both tips should be point up. If the tips do not line up and seem to be pointing in a different direction, you probably have a twist limb.
I bought an older Bear Kodiak that had a slight twist in the upper limb, and a double twist in the lower limb. If I had strung it without checking, it would have come unstrung. Bad things happen if a recurve does that.
Once I was able to confirm the twist, location and direction, I used a heat gun that puts out from 200 - 1100 degrees. With it set at about half way, move the heat gun, back and forth over the area to be twisted. If you get it too hot, the glue may soften. If the bow glued at 175 degrees, the temperature from a heat gun could surpass that, and you would have a problem. It should be quite warm to the touch. Do both sides. A heavy poundage bow, will be hard to twist enough to reset the limb.
If you do not feel confident in what you are doing, contact one of several guys on TG that do repair work.