Here's the situation:

Under the Tiefigter base there's a clustermine token - not seen on this picture.
So how does it go when you, as a rebell-player have Sabine as crew? What triggers first?
As I interpret, Sabine might go first since she has the "may" rule. Probably use her when a mine/bomb detonates.
Then Seismic Charge (bomb) since it detonate at end of activation phase. Then the imperial player roll för Cluster mine.
In other words::
1st. Tiefighter lands on Rebells Clustermine.
2nd. Before bomb and mine detonate, Rebel player use Sabine and choose the Tiefighter, Tiefighter take 1 damage.
3rd. Seismic charge blows, Tiefighter take another damage. 2nd damage.
4th. Imperial player roll för cluster mine and get 1 hit and 1 blank result. Tie is hit and kill.