Panels a) and b) are 304Å and 171Å images taken by SDO/AIA at 07:24 UT on 2011 June 2. In panel b), the red dotted lines indicate the propagation range of the fast mode waves along the funnel. L1 and L2, denoted by the green and light blue dotted lines, respectively, are the loop systems overlapping before or after the funnel in the image. Panel c) is a time-distance map showing the intensity change along slice MN shown in blue in panel b). The blue circles in both panels b) and c) are located at the same spatial position of slice MN. Digits 1 and 2 mark the start times of the C1.4 and C3.7 flares in ARs 11226 and 11227, respectively. The temporal evolution of the 304Å and 171Å emission is illustrated by a running difference movie available online. The field-of-view of the movie is the same as that in panels a) and b). The time delay in the 304Å and 171Å difference movie are 1 min and 12 s (based on their available maximum temporal resolution), respectively.