JFK (1991) deleted scene- Garrison at airport

In this scene, Garrison was at the airport and warned by former colleague, Bill Broussard warns his old boss of a death threat.

Garrison dismisses him and pops off to the toilet cubicle, where strange men start gathering suspiciously. Sensing the possible truth in Bill's warning, Garrison escapes outside only to be pursued and accosted by the 'toilet guys' as well as a hoarde of oddly-gathered uniform cops.

Were they serious about killing Garrison (if this actually happened) as even Sutherland's character had warned that he was too well known to be assassinated?
Or were they merely hoping to intimidate him away from the JFK case - even though he had already proven himself a tough enforcer.