Will an opening fuse cause an inductive kick, or not?
The inductive kick can't increase the current.  It will tend to maintain the existing current and thereby possibly cause high voltage someplace, but it doesn't ever increase the current.

In this case it will keep the current flowing a little longer than it would if there were no inductance.  The 50 kA will melt or vaporise the fuse element, which eventually opens the circuit.  The inductance will force the current to change more slowly, which causes the arc accross the dead fuse to be sustained a little longer.  Most of the voltage will be accross the fuse at that point, which puts a reverse voltage on the inductance, which allows the current to ramp down to 0.

The energy stored in the inductance will mostly be dissipated in the arc as the fuse opens.  Fuses are designed for some amount of inductance and should be able to take it.