i know exactly how bad it is in the bot lane, but from my stand point you're over extended, i warned you, and you made zero effort to run away or do anything different besides keep up the pressure on your opposing laner and you were severely punished for it.
from my stand point thats bad communication.
the acceptable response is consider whos roaming, is it an orianna or a leblanc? if its LB keep running past your turret, enemy laners wont be able to follow and thus its a 2v1 against a leblanc. if its ori you can call the mid/jungle to help out. they just cant gap close like LB can.
if you're a support you can easily remedy the situation by placing a ward in the brush thats furthest from your tower and the top laner will have something to TP to and counter gank in a favorable flanking position.
if its a 4v2 and you feel like they're running right at you, you need to place deeper wards so you have a larger margin to avoid the situation, we can only make it a 4v4 skirmish, its up to a team to prevent it outright. (which they started and likely have the upper hand)
but here we are, another round of which bot lane feeds.
i'll roam bot lane too, no problem, it just has to be as advantageous for me as it was for that leblanc.