sentences:  Most escaped souls shown in the series seem to be aware whenever a vessel is brought to their presence, especially if that particular vessel is the one intended for their capture, thus alerting them of potentially being sent back to Hell by the one wielding the vessel.Vessels don't always work for anyone, though several characters in the show other than Sam have used vessels to capture souls.A vessel will only work on the particular soul it is intended for, and has no effect on any other escaped souls.