From what he described, the horn was always activated and when he depressed the horn button he was hearing the relay disengage. If the horn was always blowing, I can understand disconnecting the horns, but not removing them. 
I had a car that developed this problem: there were points in the turning range where the horn would engage, very loud and embarrassing!
Horns were buried under hours of stuff.
Thought about removing the fuse, but it served other vital functions, so had to deactivate the buttons under the wheel temporarily.
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