I personally have used this technique ice climbing, where my anchor is quite set back from the top of the real climbing. Using terrain that is suitable is the key. There are other tricks to doing this but this gives you the idea. Play safe!
Tech Tip - Trad - Extending an Anchor on a multi-pitch route
By Molly Loomis
Illustrations By Keith Svihovec
A guide’s technique for belaying novice seconds
As the adage goes, speed equals safety in the mountains. But this doesn’t mean speed instead of safety.
Maintaining constant visual and vocal contact between you — presumably,
an experienced climber and/or guide — and a neophyte under your
tutelage will yield easier passage through terrain otherwise known as
time-suck territory. The more Beta you can offer him whilst he
cleans a stubborn piece of gear or works through a dumbfounding crux,
the less time you’re likely to waste shouting commands and vital advice
into the wind or hanging around, waiting for an electrical storm to
swoop in.
A Brand-New Masterpoint
There are many ways to extend an anchor, in order to come down
from the top of a pitch and keep an eye on your second. But often the
question remains, how do I, once the second climbs up to me, keep him on
a top belay (instead of transitioning into a lead belay) while he moves
from the extended anchor up to the primary anchor — potentially a
necessity in tricky terrain or in certain “institutional” (i.e.,
climbing-school) settings? The following technique should be utilized by
experienced climbers or guides only, and on terrain below your limit.
Illustrations By Keith Svihovec
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One
After constructing a bomber anchor atop your pitch, attach yourself
to the anchor’s masterpoint with a münter hitch (instead of the typical
clove hitch, etc.). Next, use this münter to lower to your desired belay
stance (the side of the rope leading down to your partner is your brake
strand). Because you’re attached to the anchor with a münter hitch, you
must keep your hand on the münter’s brake strand at all times. If you
want added security, tie a knot some feet down the brake strand and clip
it to your belay loop.
Illustrations By Keith Svihovec
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Two
Once at the perfect spotting perch (e.g., a small ledge), pull up
three feet of slack in both strands of the climbing rope. Because you
have to pull slack through the münter hitch, your belay will be
compromised momentarily. Standing on casual terrain will increase
safety, as will that brake-strand backup knot clipped to your belay
loop.
Illustrations By Keith Svihovec
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Three
With your three feet of slack, tie an overhand- on-a-bight using both
strands together, with the knot above both you and your second. This
knot will now function as an extended anchor, as well as a tie-off to
lock off the münter hitch on which you just lowered yourself. Attach a
locking carabiner and an auto-blocking belay device (e.g., Reverso)
through the eye of your overhand-on-a-bight; this will be the new belay
point for your partner.
Illustrations By Keith Svihovec
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Four
As your partner works his way up the route, coach and congratulate
from your perch, pulling in slack through the belay device and stacking
it as he comes. When he reaches your stance, back up the belay device by
tying off the brake strand with a figure-8-on-a-bight and clipping it
to the masterpoint. (This blocks the rope from feeding through the belay
device in the unlikely event that the belay device should slip.)
Illustrations By Keith Svihovec
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Five
Now you and your partner can simultaneously climb back up to the
original, highest anchor. As you climb, slack will generate in the
system between the overhand-on-a-bight (to which you both are attached)
and the münter hitch. (In order to maintain the belay while climbing,
you must pull down on the münter’s brake strand.) Considering the
multi-tasking involved — climbing while keeping a hand on the brake —
and the potential consequences of taking your brake hand off the rope,
it is important that you use this configuration on terrain well within
your comfort zone.
Six
Do not release your brake hand until you are both clipped into the
main anchor. Finally, disassemble the extended anchor, restack the rope,
and fire the next pitch.
Molly Loomis, a mountain guide, has used this technique more than once to encourage a second.