Roswyn hurls a pair of javelins at any surviving riders before running adjacent to the edge of the webs and vines. Maybe she could flank any riders trying to flee and cut off their escape.

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Initiative:(1d20+3)[20]
Attack:(1d20+5)[7] or (1d20+5)[7] for (1d6+3)[4]
Extra Attack: (1d20+5)[19] or (1d20+5)[16] for (1d6+3)[5]