I have one that's doing the exact same thing. The secondary spike grew horizontally, and it now has six large flowers. I did not stake the secondary spike, but the primary spike still has its stake which is helping to hold everything in place. Due to the heaviness of the new flowers, the pot wants to tip now, so I did have to put it in a heavier outer pot for the time being.
I would just leave the new spike to grow as it wants. It probably won't get overly long. Do keep an eye out for any tipping tendency, though.
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Cheri
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