I can’t count how many times I have had my army decimated by a Widow Mine I have had a full army of 196 supply and after wiping out an attack wave a couple of Widow Mines kill basically everything dropping me down to less then a handful of units the only way to detect is if you scanner sweep and I am not superhuman or a pro so that doesn’t even cross my mind until my army flashes red and is then dead. So if your ally has a detector but it is not close enough then you are in trouble and if your ally doesn’t make detectors for some reason even after you ask then you are done.
lol So sad. Get better then.