I would say it is in both shell and arrows interest to have the stock priced capped around 5.20 or so,
it would be hard for arrow to continue to recommend accepting the deal if the share price rose to 6 bucks, cause there is no way they can justify dart being worth that 1.30, its hard enough to put much, if any value to it at present (too many unknowns i'd imagine).
if the price went to 6, then likely the deal is no longer "fair value" and shell would have to sweeten it further, so they don't want it going up
and also, i'm not sure if arrow are allowed to change their position once they have recommended sell, so maybe it is less headache to just keep the share price where it is, and thus both companies are happy for the sp to stay where it is
AOE Price at posting:
$5.17 Sentiment: Hold Disclosure: Held