Okay. Spend a free action to watch as the javelin flies 5' away from me (yet somehow ends up in my square...).
Also, not that it matters much, shouldn't LoS have been established when I rounded that corner? As in, G18? He's higher than me, and nothing's blocking the way. Anyways, I will just attack from where I am, since I'm 30', have moved 10', and can. Even if LoS was established earlier, I would have continued to here.
attack: (1d20+5)[21]
damage: (1d8+1)[9]
skirmish: (1d6)[3]
crit: (1d20+5)[14]
Don't worry, even if I hit, I need to do max damage to take you out. Assuming I don't crit, of course. Then I need to roll 2 above average.
EDIT: Oh. My. I almost rolled max.