The painfull reality of when your enemy laner Roams in low elo
The situation
Your enemy laner roams somewhere, you know exactly where they are going and ping red to the lane while warning them in chat "care, you are about to get ganked"
Idealisticly, this means your ally will play safer for a minute or two, respect they are in a hot zone and not push lane.
Idealisticly your ally is playing safer while you go to take the tower in your lane and everyone is happy.
Reality If you are not in plat, expect your ally to be a idiot, shub lane, and die to your laner, ingoreing your pings and what you typed in chat, as they then flame you and go "wowwwwwwwwwwww thanks for the help" while spamming you with missing pings.
Reality of what you have to do Just follow the guy, no matter how many times u warn your ally, they will do something stupid and possibly die, so just follow the enemy laner and hope you can fix the situation.
Remember kids, always expect your teamates to do the stupid decision.