Something tripped my alarm and I ripped the hand out of my pocket before I lost anything, that dude was gone in a flash, the other two urged me to go through the gates as I would lose my ticket.
Then I remembered the recommendation to swear angrily in Russian at them and came up with a few of those I knew and the other two took a hike very quickly. Apparently they are very afraid of Russian speaking people.
Anyone who doesn't look Spanish is likely to get pickpocketed on Las Ramblas. I've heard multiple stories and seen it myself despite having only visited a few times.
I wouldn't feel unsafe there, but the risk of getting robbed is very high.
I'm surprised this is not common knowledge among people from there, maybe try 15-20 minutes people watching anywhere along Las Ramblas and see for yourself. Busy, sunny days with lots of people and police around are the best times to spot the thieves. You'll also frequently see tourist couples speaking to police reporting the robberies. You can watch the body language and gestures from a distance and it is very obvious.
The place is also fairly well known for robberies of tourists in rental cars on the way to and from the airport. We were cautioned about this and rented a car from the other side of town instead.
My grandpa lost consciousness and had to be taken to a nearby hospital.
After he woke up, he said the people around the incident just ignored them, even though he called for help. He said he got the impression that it must be an everyday occurrence.
Bastard ran up £3k in premium rate calls by the time I got back to the hotel to cancel it. Luckily I was refunded for those!