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President Donald Trump鈥檚 extraordinary Thursday evening approval and cancellation of an attack on Iran has not de-escalated a very tense situation so much as paused it, while wrapping American intentions in yet another layer of mystery.

But a pause could be better than a continued upward spiral. By refraining from a kinetic response to Iran鈥檚 shoot-down of a Global Hawk surveillance drone, Mr. Trump, purposefully or not, could allow Iran the opportunity to come to the negotiating table as a comparative equal. The Iranians would not appear to be compelled to bargain by the weight of U.S. bombs, according to Rob Malley, president of the International Crisis Group and a former Middle East adviser in the Obama administration.

鈥淧erhaps his decision (so far) not to strike Iran opens up [a] small window for diplomacy,鈥� tweeted Mr. Malley on Friday.

In a larger sense, U.S. strategy on Iran now appears to be the equivalent of two trains on different tracks, proceeding full speed in opposite directions.

In canceling a military strike reportedly after planes were airborne and ships moving into position, Mr. Trump appeared eager to publicly show restraint and a desire to respond proportionately to Iranian provocations. This would be consistent with his 鈥淎merica First鈥� promise as a candidate to keep the U.S. out of endless Middle Eastern wars.

But of course it was Mr. Trump himself who had ordered the launching of the attack he pulled back, following bellicose language such as a tweet that Iran had made 鈥渁 very bad mistake鈥� in shooting down the U.S. drone.

In the nonwake of an action that he decided should not happen after all, the president continued to talk in a combative manner. On Friday he tweeted that the U.S. military remained 鈥渞eady to go.鈥�

鈥淚t still leaves us in a very tense situation that could rapidly escalate,鈥� says Barbara Slavin, director of the Future of Iran Initiative at the Atlantic Council.聽

Hard-liners on both sides may want further confrontation for their own purposes.

In Iran, some leaders might see conflict as a way to rally a population demoralized by the bite of U.S. economic sanctions. In the U.S., National Security Adviser John Bolton, and to some extent Secretary of State Mike Pompeo, have pushed for out-and-out regime change as a means to curb Iran鈥檚 regional ambitions and abuses.

If Mr. Trump truly does not want to involve the United States in another Middle East conflict that produces another failed or tottering state, now is the time for negotiators to start talking, says Ms. Slavin.

鈥淚鈥檓 really waiting to see the Trump administration name perhaps a special envoy of demonstrated success ... to begin talks,鈥� she says.

The opacity of the U.S. approach to Iran remains a problem going forward. What are the Trump administration鈥檚 specific goals?

Mr. Trump withdrew from the nuclear agreement with Iran because, he said, it was a 鈥渂ad deal鈥� that did not curb Iranian nuclear capability in perpetuity, nor address other issues such as Iran鈥檚 support of militant groups in Syria and elsewhere. But how might that be accomplished? Via a new nuclear pact, or a destabilized Iranian government, or full-on regime replacement? The administration鈥檚 answer to this seems to be to apply crippling economic sanctions and see what develops.

Plus, what happened on Thursday? Was the last-minute wave-off of the U.S. attack truly caused by a change of heart on the part of Mr. Trump, as he described? Were aides who wanted him to change his mind behind quick leaks to the media? Or was it a pre-planned action and leak to try to present the president as both tough and restrained?

In any case, the Friday reaction to the whole affair broke along some surprising lines. While much of the response was predictable and partisan, some Republicans grumbled that Mr. Trump looked weak in allowing Iran to destroy U.S. aircraft with impunity. Some Democrats who are typically fierce critics of the administration allowed as how the result, so far, was better than fighting.

鈥淚 don鈥檛 think that people should be jumping down the president鈥檚 throat for wanting to think this through and make sure that neither side miscalculates and we don鈥檛 inadvertently end up in a war with Iran,鈥� said Democratic Rep. Adam Schiff of California, chairman of the House intelligence committee.