Hurry need quick advise for a shoot in an hour!!!!

[Drakeskakes]

So my friend just asked me to do some headshkts and were going to be out doors and can unfortunately do it an noon. I'm worried aboutthe high sun and shadows under the eyes. I'm gonna be experimenting with a low setting fill flash. I'm using a 430ex II and I have a flash bracket to put it high above the lens in potrait mode. I'm probably going to be using the 100mm 2.8

So the flash can't shoot faster than 1/250 Right? Otherwise you show the curtain?
250 is going to be way to slow and it'll be really over exposed. I could obviously use a narrowed appetature but it's going to take away from my nice blurry backround

what's the best way to go about this?

[Swaffs]

why not use a reflector instead, get the subject to hold it out in front of them bouncing the light up.

[Drakeskakes]

I don't have one :( any quick DIY?

[710 Studio]

Just a white piece of foam core board makes a great reflector.