such an old joke. Your first question.The answer is a NO not a PCSO....
When these coppers are in a situation like that thing you call a "soilder", unless they are already aware of him, know him from past experiances, they would not know if he had any warning markers etc.........
To do this you would need his name, dob to PNC the chap. If he is known then the information would be disclosed to the officers. However,times like this you dont have the chance to or would chance it, espeacially if he has threatened you in some way etc...... which this chap might of done. If back up was call