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You can chain against the effect of "Byser Shock".
A Trap Card like "Ceasefire" that is chained to the activation of "Byser Shock"'s effect is not returned to the hand.
A Trap Card like "Ceasefire" that is chained to the activation of the effect of "Byser Shock" is not returned to the hand.
"Byser Shock" does not get its effect if Special Summoned face-down. "Byser Shock," if later Flip Summoned, it will have its effect resolve at that time. "Byser Shock" will not receive its effect if Flipped as a result of an attack or an effect.
If "Skill Drain" is active or activated in a chain to "Byser Shock's" effect, the effect of "Byser Shock" is negated.