Regular people go to see Taj Mahal. RailFans go to see Ghaziabad Jn. - Praveen

An experience cum query, by comparing two scenarios:
#Race_with_AP_exp
On April, I had a ticket in AP Exp from AGC to NGP due to some traffic jam i got late and when reached at stn, train was departing and the time i entered it was Guards' bogie in front of me, I was running parallel with train and requesting him to stop or slow down a bit. Meanwhile at SLRL is saw some Marathi Ladies and i by default started shouting in Marathi "thamba, pls halu kara, geli majhi train.." and...
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even with guard too, they were also asking guard to stop and giving hand to me bt i dnt wantd to take risk and board. I continously ran from pfs one end to another bt guard didnt stopped, giving reason "piche se train aa rahi hogi", bt to my surprise no train came for next 1.5hrs. I was so tired and melting down with thirst that RPF guys were giving me water, they askd me to lay down properly, bt i was sad coz i missed the train.
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2 days before at CNB, i was at pf, JU HWH arrived, and a guy entered the pf when train was departing, he wantd to board gen, and requested guard to stop, and to my surprise he stopped the train, though AP was also running in same speed as of JU HWH. Whats the rule for it, can't guard stop the train? Why AP guard didnt stopped while JU HWH guard stopped it. ?