Learn the tone, meaning, and better English alternatives around "two guards on" with real scene examples.

It means the guards are leaving their post near the entrance, so the speaker thinks there may be a chance to move in.
From Collateral Hearts, Episode 42
Someone is assessing guard movement to find an opening at the entrance.
Use this kind of line when describing security movement or explaining a tactical situation. It is not a general everyday phrase, so it is mainly useful in suspense or action contexts.
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