The Salad of Colonel Cray

Father Brown happens to the home of Major Putnam when shots are heard and a shadowy figure is seen. Colonel Cray, having served with Major Putnam seems to be out of his mind as he claims to have shot a burglars but is that really the case?
Apparently one should avoid looking at monkey's tails, double check your salad dressing and be wary of boomerangs passing through your bedroom!