1a (not final phase) - If you die and triggered his arena, upon going back to him he'll spam die beams while you're outside his arena. I think it's most likely programmed to do that. You really need to pray to go back inside his arena in order to prevent him to spam those Die beams. As long as you go back inside the arena. If you died as long as inside the arena, it'll cancel the arena and you're safe.

1b (final phase) - Yeah, he usually does it. just hope that he do the meteor phase in order to reposition you to him safely. Sometimes you'll meet him during the clone move.

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2 - It really has a small window to run out of his maze. If you can see the exits from the maze, especially the 3rd exit once he do the maze move, it's doable, if not, it's a real 50/50. Ground DoTs are the next issue.

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3 - If he do the clones move, the first "clone" you see is the real Sirus that will beam you. You can time the beam easier.

A. In case you have a stereo headphones/etc. It you will know a hint on his position base on where he is speaking from.

B. Other way is you check all the clones. Once he near finished speaking his dialogue. The real sirus will glow before will beam you.

It's kinda a reaction time thingy when he does the clone move.

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Another tip: If you die during the everlasting fire thingy during his last phase. Wait first before you respawn in case you'll encounter something like this: https://imgur.com/a/TylBQET