All-In vs. Chip Leader?

[zoobird]

Freeroll tournament, down to final 29 people (out of 679). I'm button (in 3rd place w/75,000 chips) with A8o, chip leader is in SB and has over 200,000 chips. Blinds/Antes are 800/1600/100. I've been at this table for a while, and chip leader has been commenting the whole time how much I'm stealing the blinds. Folded to me, and I raise to 6400 (my usuall 4 BB raise). Chip leader goes all-in. I...