How it works
Ḃœp⁸Ḣ Main link. Argument: A (array) Ḃ Bit; yield 1 for odd integers, 0 for even ones. ⁸ Yield A. œp Partition A, splitting at 1's in the bit array. This yields a 2D array of runs of even integers. Ḣ Head; extract the first chunk.