Could dispersion target opponent's card?

[BGA_NICE99]

What happened at step 56?

At step 56, it seemed like the dispersion (costed 3  ) was casted on cremation, which was not in the player's own hand. Then, not only all creatures on the field disappeared, but also both sides got the hand protection effect (the red frame around the card count).

Spoiler for Hidden:

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[serprex]

dispersion cast on stasis, procs 3 ricos

[BGA_NICE99]

Ah.. I see. Thanks.