Advocate Francesca Pinel represented Robinson and indicated her client’s ‘guilty’ plea to the single charge.
Crown Advocate Matthew Maletroit appeared for the prosecution.
Pictured: The teenager will be sentenced in the Royal Court for the assault.
The Deputy Bailiff, Tim Le Cocq, presided over the hearing, accompanied by Jurats Collette Crill and Elizabeth Dulake.
The teenager is due to be sentenced on 13 September.