@[member="Phylis Alince"]
Siobhan's usual tactic when faced with a volley would be either to try and dodge or to thrust it back with her telekinesis, preferrably aiming to bludgeon the enemy to death. Perhaps throw up environmental obstacles, like the tank she had levitated to block the thousands of high-powered laser shots Tricia had shot at her at one point during their duel...before throwing the tank at the dark master. When it came to such a volley of shots she was facing presently she might have actually just taken the hit, anchoring herself to the ground.
However, the point of the training was to focus on strengthening her force-based defence. So come flying the volley of small stones and peebles did. Individually not a threat, if thrown as scatter shots and with strong kinetic force behind them, that would be a different matter. Holding the shield up was causing an evident strain on Siobhan, for her seemingly boundless energy was conditioned towards offence, but she poured more energy into the shield. Pressure was brought on her defence as the shots clashed with it and she pushed to maintain it, though they were deflected from her, scattering to the winds.
However, then came the stone being shot towards her back. Now, despite her notoriously short attention span on many things, Siobhan was aware of her surroundings, simply because not made you liable to getting shot in the back on the battlefield. Or getting your legs blown off by a thermal detonator. However, she had been concentrated on keeping the shield up and though she stretched out with her senses to anticipate dangers, her focus was off. So it was late when she sensed the incoming projectile and instinctively spun, dodging and thrusting it back just as it would have almost hit her face. Amidst this the force shield embracing her dissipated.