I have fished for bream for years and have obseved that in shallow water or slow current situations they almost always 'taste',the bait twice,before swallowing it and moving off.
When they are 'tasting' they lip the bait and move it a short distance before immediatly spitting it out,and watching it.They repeat this a second time and if satisfied that it is OK return and eat it.If the bait moves after they have tasted it they swim off.The 'give' in fine mono (up to 20% of the length) would allow a small amount of stretch easily but braided line would tend to pull the bait back to its original position.
To avoid this problem you can leave the bail arm open,but unfortunately braid pulls off the spool with much more noticeable resistance than mono,thus alerting the bream to the presence of line.
Whether I fish for bream or kings if i put the rod down for any reason i always open the bail arm !