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That's really only an issue at low level and/or low optimization. A good Archer can handle a single enemy, even an Elite by themselves; if multiple unengaged enemies are heading toward the lone Archer, then the rest of the party should be able to respond and engage in time unless the enemies are double moving, in which case that's just lost attacks to gain the ability to drop the Archer for a single round, it looks scary but is actually the less powerful tactic. Now, if multiple enemies are managing to disengage from the rest of the party, then that's a major problem with the builds of the party.