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< For both arcane shield and prot pots
Both Arcane Shield and Prot pots count as "protection" (shields that block physical damage and/or damage from all sources [Arcane Shield]) and they do nothing to prevent any type of crowd control that comes from other skills (Forceful shot, Achilles; and Rupture's mag damage will get absorbed by the Arcane Shield until the shield is no more). So the answer to your question is NO, "shields" don't help in dealing with these skills and can only block the physical/magical damage instance that is necessary to apply them or the DOT damage if the shield is still up by that point (dagger hit from Rogue and DOT from Rupture, Frany hit from Barb and DOT from Achilles, arrow hit from Ranger).