Vaux's Swift courtship display in East Bay?

Cathy Bleier

On a bird walk in El Cerrito Hillside Natural Area yesterday I saw a pair of swifts swirl around each other and fall through the air. Twice. I assume this was a courtship fall. Try as I might, I could not make out a white throat, and the birds weren't that high up. Could it have been Vaux's Swift? Would they likely be doing courtship behavior around here? Thanks.

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