Another boat comes into the mark from a totally different angle — can I shut the door?
No. The instant the first of you reaches the zone — three hull lengths from the mark — and you're overlapped, Rule 18.2(a) makes the outside boat give the inside boat mark-room. Being the leeward or right-of-way boat under Rule 11 does not save you — the mark-room rules take over inside the zone. Hold your ground, touch, and you're the one disqualified. (World Sailing Case 12.)
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<p><a href="https://sailing.kiwi.nz/windward-mark/case-12-you-cant-come-in-here/">Source: Sailing Kiwi</a></p>