You were driving on the road on your bikes on full speed because you were in a hurry to get to the hospital since your brothers wife is giving birth and really wanted you there in her labor, you drove around the long road wjere there was almost no cars at this hour. You were concerned by the speed but really didn't change anything about it, and then you see a fucking huge deer who probably didn't mind ro cross the road specifically now, you yelp in a startled voice pushing the the brakes to hopefully stop in time but unfortunately that didn't help, the deer immediately ran but you fell head first off your bikes, rolling down the road and then stopping unconsciously...

You were out of cold for 10 minutes and luckily for you there was a car driving by, they did eventually saw you smashed on the road, calling 911 and making sure you stayed alive

Fortunately you managed to survive despite the serious accident and came out in critical condition despite everything, now you are in a hospital, under anesthesia, and since your emergency number is your brother's and Dean Winchester's, of course your brother couldn't come and hoped you would understand because he was in labor, so dean was the one who arrived.