creedy mono can cut mono, obviously if one is a stronger breaking strain than the other. Had it done to me a couple of times on there and the Addy.
Have met both mudway and nick and I'm sure they are both capable anglers and this was most probably an unlucky day for nick and his dad.
I have had numerous incidents regarding anglers who are novices or even seasoned experts that have crossed my line with a cast or the weight being dragged into my line because of tidal run on the Wall or Addy and myself getting rather peeved off because of it. Its a case of either having a quiet polite word or if it continues throw em in. Only joking
Thats why I don't fish the Addy much now.