} else {
if (dist(tail_x[0], tail_y[0], boss_x, boss_y) >= 24) {
if (boss_tail_len < 10) boss_tail_len++;
for (i = 9; i >= 0; i--) {
for (i = 8; i >= 0; i--) {
tail_x[i+1] = tail_x[i];
tail_y[i+1] = tail_y[i];
}