Pretty formulaic.
You just need to save Boothill's ult before phase switch, then use it immediately on Argenti when he spawns.
You should be able to burst him immediately to his second health. This is where you pray that Argenti doesn't buff the shield mob. We need to kill the sword mob to dispel the shield on Argenti, then immediately use Boothill's ult on Argenti to stop him from attacking us.
Then the rest is just self-explanatory.

E1 on Boothill is probably not needed since we get the free trotter at the start for 2 Pocket Trickshot stacks.
You will need E1S1 on both Ruan Mei & Bronya for the SP economy though. Bronya's E1 needs to proc at least once.

0:00 Technique prep
0:09 First phase elites
1:00 Second phase boss, use Boothill's ult immediately on Argenti

2:13 Team stats

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