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The Squire's aim is to use the Move Action to remain beside Oberon.
If someone hits Oberon, he would then use the Defender Trait (is that an Action? or a 'free' reaction?)
Defender: When an adjacent ally is hit, before Evade Tests are made, you may choose to have that attack hit you instead.
Then, if hit himself (which I imagine is automatic) he would use Goblin Agility + Shield Bearer
Goblin Agility: Test 1d6 whenever you are successfully hit by an enemy.
If your Test is successful, you evade the attack and do not take damage.
Shield Bearer: While wielding a shield, Test with 2d6 on Goblin Agility Actions instead of 1d6
I imagine that this (Goblin Agility+Shield Bearer) is not an Action? But a 'free' reaction?
Then, anything else would depend on whether The Squire has an Action left or not