does anyone know what are the conditions for a 'loss prevented'

Ever since i started playing better, warding, having higher cs, making better decisions and plays, i started getting bothered when i lose games for silly reasons like an afk, or someone's internet connection who kept dc and reconnect every 50 seconds.

I think of previous games where i lost so much lp for similar instances.

I want to see loss preventions more often. When it is fair to give one,

Take this as an example, out adc is afk since lvl1 for 24 minutes, at this point we have lost 5 turrets , 2 dragons and although our top laner and our bot lane of malphite/udyr(thats me, i was originally jungler) is doing ok considering we have to face a jinx and a nidalle.

Then at 24 minutes lucian reconnects at lvl1 amd starts playing, at this point the enemy team is so far ahead in objectives amd gold, they have taken so much from us and it's a certain loss. I politely ask lucian to go afk as this may make it loss prevented. He starts harrasing me and throwing f bombs. He keeps harassing the whole team so does to the enemies who killed him.

This games ends a few minutes later and after so many surrender votes failed.

I lost 15 lp and ofcourse no loss prevented for that one.

I think it would be fair if it was prevented. It makes sense, noone can come back from this deficit and to all those who say that 4 v5 is possible i can tell you that yes it is. I have won a 3v5! The thing is that not all enemies are bad, some people know how to snowball and a 4 v5 for 23 minutes should be a loss prevented.