If you start a game of howling abyss after his changes (added mark/dash etc.) you will notice that after you destroy the nexus (i have tried it when you destroy the purple one) the blue nexus suddenly appears in the place of the purple.
in the first picture you can barely see the nexus but in the second one You can see it in the right side of the screen.
P.S. after the blue nexus explodes the blue nexus returns just the same way as the explosion of the purple one.
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