It knows enough about ice, about magic ice to avoid it on purpose. The beast dealing with such a minor inconvenience does give Sephiroth a decent head-start, and he can certainly move at considerable speed when he needed to, but there's just one problem.
There's someone in the way.
It's easy to assume that this is the master of the keep and thus the behemoth's owner, but it could also be some random idiot who doesn't know a behemoth from a puppy dog and is about to become chow if Sephiroth allows it to happen. The sound of crashing pursuit tells him plenty of exactly where the monster is, so his focus is on what's between himself and questionable 'safety'.
Putting unknown people at risk simply because they're in the way is unacceptable.
For better or worse he makes his decision quickly, and his trajectory alters ... just slightly, to directly intercept the still, silent figure also all in black. The gatehouse's wall further behind was not an easy jump on his own, recalculating it with the potential added weight of two hundred or so pounds of possibly very unwilling burden. Putting the man somewhere the Behemoth won't notice him and lure it further away is an unwelcome sudden new priority.
Maybe it's an attack, from the perspective of the stranger, but if Sephiroth can get close enough, he's going to attempt to yank the man right off the ground and drag him with him in a leap upward for the top of the gatehouse's parapets. That won't be high enough to avoid the behemoth but that's not the goal.
Catching a Dominant is often easier thought about than done though.
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There's someone in the way.
It's easy to assume that this is the master of the keep and thus the behemoth's owner, but it could also be some random idiot who doesn't know a behemoth from a puppy dog and is about to become chow if Sephiroth allows it to happen. The sound of crashing pursuit tells him plenty of exactly where the monster is, so his focus is on what's between himself and questionable 'safety'.
Putting unknown people at risk simply because they're in the way is unacceptable.
For better or worse he makes his decision quickly, and his trajectory alters ... just slightly, to directly intercept the still, silent figure also all in black. The gatehouse's wall further behind was not an easy jump on his own, recalculating it with the potential added weight of two hundred or so pounds of possibly very unwilling burden. Putting the man somewhere the Behemoth won't notice him and lure it further away is an unwelcome sudden new priority.
Maybe it's an attack, from the perspective of the stranger, but if Sephiroth can get close enough, he's going to attempt to yank the man right off the ground and drag him with him in a leap upward for the top of the gatehouse's parapets. That won't be high enough to avoid the behemoth but that's not the goal.
Catching a Dominant is often easier thought about than done though.