Derek ruthlessly trains his pack betas, even if that breaks a hundred bones a session, fearing the new beast may be far too strong to fight alone. Stiles happens to witness it crushing the cocky stud who handles his truck in the garage, so the sheriff must confiscate it. Scott and Allison sit trough dinner for her visiting grandfather Gerard Argent, who seems to support the young couple against her overprotective father, but actually is testing Scott. The kids frantically search his room for the 'bestiary', old Argent record enabling to identify and hopefully fight the creature. Meanwhile Scott must play lacrosse, a match attended by Gerard. DErek and Stiles end up in the swimming pool, besieged by the beast, whose presence paralyzes Derek due to his earlier spine wound, so Stiles must keep him afloat, or release him just long enough to try using his cellphone.
—KGF Vissers