Why would you use jiujitsu against 2 people when you're within your rights to escalate.BJJ is great. But yeah if you are on the ground against an opponent and he has backup you are cooked. Unless it’s a one on one situation you should avoid the ground at all means
In the streets it’s rarely one on one
2 people swinging on you at the same time are trying to seriously hurt you. Their health shouldn't be a concern for whoever getting jumped