He should have made himself scarce, not hung around filming.
Perhaps, or perhaps the Bulgarian man and woman were threatened by a group of youths, with knives and hatchet?
Who knows fir sure? We need to wait for more details.
Right now we know the incident happened in a poor district known for youth knife crimes, we know that it was a Bulgarian couple, and we know it was a 12 year old girl with the knife.
That’s it, the rest is speculation