BrainKing - Plke o špilošovi (drafty)

Hi, i'm learning mancala. I want to place my last bead in an empty hole opposite my opponents beads(b1-c1, move 5) but i don't understand why their beads aren't captured. can you explain, please?

Okázat kontext

Plke špiloša drafty na veřénéch klobech na mloveni:

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