actually, Beth (with Alicia's help) takes control of the infection... instead of it controlling her... and then quickly regains control of Awakened Alicia....
Quite impressive for the rank 2 Beth !!!!
(It is my understanding that sisters, are equal in power, so being identical twins, Beth should definately be equal in power to Alicia, and they do seem to be equal in power... well you'll come to see why...)
(however, personally in being in control of the Soul Link, that's some yoki power... which to me makes them, Beth and Rafaela, actually more powerful then their sisters, whom merely Awaken... I mean even a rank 47 can Awaken... that's easy... controlling the Soul Link isn't.... controlling an Awakened rank 1, an Abyssal One, isn't easy... Beth and Rafaela deserve their earned respect!)