Shining Strike - Search for a Theseus activation card and gives +2 to attack & defense, plus initiative.
Ariadne's Thread - move when attacked.
So, when Theseus is attacked, can he
1) Activate Shining Strike
2) Retaliate with boosted power
3) Then retreat with Ariadne's thread
Basically turning an attack on him (or his guard target)back on the attacker?