While i was not able to come up with a solid number, I am positive that it places the same amount on each mob hit, and that amount seems to be constant regardless of number. I was actually thinking it was about 400 with a +/- of 9. I can confirm is a set amount across all mobs hit, and that it doesn't decrease based on number hit (unlike rampart unfortunately). That said, its still weaker-ish than flash so not really that powerful.