mamba
Legend
yeah, I expect them to be in the same square, to me you cannot grapple someone in an adjacent square.Feels like you'd run into the "ending a turn in the same square" rule. Possibly being able to prone them for free.
That rule is more about fighting one another, then you cannot really occupy the same space as someone else, when grappling that is required however. You cannot really grapple someone who keeps you at arms length