When reading the form guide, if seeing those comments if you then peruse the Stewards report as a whole you will get abetter idea of what happened. The Sportsman has most current reports and they can be accessed on line
http://www.risa.com.au/Blocked for a run, would mean the horse is going well but can not get a clear run. You see the jockey has a pretty good hold of the horse but he only has horses bums in front of him.
Striking interference and or tightened for room would mean they have a clear run but than a horse takes its running, closes a gap or forces it wider or inward.
If when reading that brief report in a horses form, have a look at the video or if that is not available have a look at the Stewards reports. You will get better idea of the severity of those comments.