The magical barrier that imprisoned them also blocked all forms of communication, creating complete isolation from their allies. Their warning signals simply dissipated against the king's spell work without reaching any external recipients.
"The signals aren't getting through!" the first guard said with growing panic, shaking his crystal desperately.
"We're completely cut off!" confirmed his companion, his professional composure cracking as the the reality of them being imprisoned from the outside world became clear.
..
Both guards drew their weapons, but their blades felt useless against the magical imprisonment that offered no physical target to attack. They were trapped within an air pocket, surrounded by water and magical barriers that defied their resistance.
"This is at least a master-level spell work," the first guard assessed grimly, his experience allowing him to recognise the sophistication of their prison.