I first must admit that I have never worked off of an elevated platform. I have only worked at agencies that have had straight sticks.
But, this picture is a little harrowing. Could be that this photo was taken right at the moment that it vented.
Just be careful and be aware. It looks like the fire was already vented or close to it because they aren't on the roof and it looks like it would be difficult to physically cut from that bucket.
Again, I only have this small capture of time to go by. But if that fire ball had been bigger this could have gotten ugly.
I've worked out/off of the bucket, my guess is this is a "dramatic" shot but in reality the bucket is not right over the venting flames. On our stick the bucket can be operated from the bucket or the seat and typically we would have 2 men in the bucket, so one is watching and operating the stick while the other works. That being said, one a hole is cut the drywall has to be knocked out so there is always a good chance of a fireball shooting up, that's why it's always full PPE/BA and caution.
I know that on our bucket we have a button we can step on that will allow a shower of water to come out from under the bucket for exactly this reason. Otherwise, you are cooking the bucket and will need to have it tested when you are done most likely.