I can't find a solution to this enigma.
When I am over the button, grates rise which keep me from shooting the 3 question marks:

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I can't find a solution to this enigma. When I am over the button, grates rise which keep me from shooting the 3 question marks:
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Set explosive gel on the question marks beforehand, then go stand on the button, zoom in and use the remote detonator to detonate the gels in the correct sequence.
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