While what RobS says is true, it's not the 'rule'. Where to cut is a matter of personally preference, and also depends if the spike starts to yellow after losing the blooms.
On a spike that stays green, you can cut back to right above a node like RobS says, which will usually force a side spike to start. However usually that spike will have less blooms and the plant is also more likely to produce less floriferous spikes next time it makes a new spike.
The other option is to cut the spike all the way down to the bottom. If the spike starts to yellow after losing the flowers you cut it down completely anyways, since it won't do anything more.
Where to cut is a matter of personal preference, it depends what you want. I personally do not believe in forcing the plant to bloom again. I would rather have a strong plant that can make good strong spikes in it's next natural blooming.
As for your plant blooming in the middle of winter, that's the normal blooming period for most phals. Phals induce their spikes in early fall, in response to a lowering of the overall temperature. A spike takes about 3 months to develop, so most plants start to bloom between november and february.
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Camille
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