How to place a bounty on a slight modification of a question that is not mine?

I have been thinking a lot about the question: If a mass moves close to the speed of light, does it turn into a black hole?

But I didn't find the answers satisfactory. I have two options:

1. Ask the question "WHAT happens if a mass moves close to the speed of light", cite this question, and then see if it gets a response, if not then create a bounty.

2. Is there some way to place a bounty on THIS question, with the added rule that I want a more rigorous mathematical derivation/description of what the observer sees and what the relativistic object sees.

If there was a way to accomplish (2) I think that would be better for the community because:

a. There are fewer questions asking almost but not quite the same thing.

b. Almost anyone that reads my hypothetical question would be interested in the OP's and vice versa.

• Whatever course you choose, you need to clearly explain why the existing answers are not satisfactory for you. There's not much point in asking for rigorous mathematics if you don't properly understand the underlying principles. – PM 2Ring Aug 27 '19 at 7:25
• The thing is, the bricks in the walls of your house are travelling close to the speed of light, as viewed by a passing neutrino. And as far as I know, they haven't turned into black holes yet. What the question seems to show is that you haven't understood the basic ideas of relativity yet. – alephzero Sep 5 '19 at 21:20
• the bricks in my wall look probably extremely strange to a passing neutrino – frogeyedpeas Sep 5 '19 at 21:21
• @frogeyedpeas Yes, but a brick is either a black hole or it isn't. If doesn't change to and from being a black hole depending on who is looking at it. – alephzero Sep 5 '19 at 21:22
• Probably move to chat soon, but is the apparent density of the bricks different from a neutrinos frame of reference versus ours? – frogeyedpeas Sep 5 '19 at 21:23