If you don't care about the last two item pickups, try this:
Walk to the front edge of the ice ledge overlooking the snowbank you used to reach this ledge earlier and step off (don't jump).
As soon as Lara touches down, the Guardian will emerge from his cave.
Immediately roll. . .
. . . and take a standing jump back up to the ice ledge.
The Guardian can't reach Lara here. So you can shoot him with pistols at your leisure. When the Guardian falls, the level ends.
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